DOCSLIB.ORG

Cretaceous–Paleogene Plant Extinction and Recovery in Patagonia

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Cretaceous–Paleogene Plant Extinction and Recovery in Patagonia Paleobiology, 46(4), 2020, pp. 445–469 DOI: 10.1017/pab.2020.45 Featured Article Cretaceous–Paleogene plant extinction and recovery in Patagonia Elena Stiles , Peter Wilf, Ari Iglesias, María A. Gandolfo, and N. Rubén Cúneo Abstract.—The Cretaceous–Paleogene (K/Pg) extinction appears to have been geographically heteroge- neous for some organismal groups. Southern Hemisphere K/Pg palynological records have shown lower extinction and faster recovery than in the Northern Hemisphere, but no comparable, well-con- strained Southern Hemisphere macrofloras spanning this interval had been available. Here, macrofloral turnover patterns are addressed for the first time in the Southern Hemisphere, using more than 3500 dicot leaves from the latest Cretaceous (Maastrichtian) and the earliest Paleocene (Danian) of Argentine Patagonia. A maximum ca. 90% macrofloral extinction and ca. 45% drop in rarefied species richness is esti- mated across the K/Pg, consistent with substantial species-level extinction and previously observed extir- pation of host-specialized leaf mines. However, prior palynological and taxonomic studies indicate low turnover of higher taxa and persistence of general floral composition in the same sections. High species extinction, decreased species richness, and homogeneous Danian macrofloras across time and facies resemble patterns often observed in North America, but there are several notable differences. When com- pared with boundary-spanning macrofloras at similar absolute paleolatitudes (ca. 50°S or 50°N) from the Williston Basin (WB) in the Dakotas, both Maastrichtian and Danian Patagonian species richnesses are higher, extending a history of elevated South American diversity into the Maastrichtian. Despite high spe- cies turnover, our analyses also reveal continuity and expansion of leaf morphospace, including an increase in lobed and toothed species unlike the Danian WB. Thus, both Patagonian and WB K/Pg macro- floras support a significant extinction event, but they may also reflect geographically heterogeneous diversity, extinction, and recovery patterns warranting future study. Elena Stiles. *Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802, U.S.A. E-mail: [email protected].*Present address: Department of Biology, University of Washington, Seattle, Washington 98105, U.S.A. Peter Wilf. Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802, U.S.A. E-mail: [email protected] Ari Iglesias. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)–Universidad Nacional del Comahue INIBIOMA, San Carlos de Bariloche 8400, Río Negro, Argentina. E-mail: [email protected] María Alejandra Gandolfo. L.H. Bailey Hortorium, Plant Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, New York 14853, U.S.A. E-mail: [email protected] N. Rubén Cúneo. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)–Museo Paleontológico Egidio Feruglio, Avenida Fontana 140, Trelew 9100, Chubut, Argentina. E-mail: [email protected] Accepted: 27 August 2020 Data available from the Dryad Digital Repository: https://doi.org/10.5061/dryad.jsxksn071 Introduction et al. 2010). Although the K/Pg event affected The devastating environmental conse- biotas globally, the severity of the extinction quences of the end-Cretaceous bolide impact and the pacing of the recovery were geograph- affected both marine and terrestrial organisms ically heterogeneous for some groups of organ- (e.g., Alvarez et al. 1980; Prinn and Fegley isms (see next paragraph). Modern biodiversity 1987; Robertson et al. 2013; Vellekoop et al. is shaped by the surviving lineages of the K/Pg 2014; Tyrrell et al. 2015; Artemieva and Morgan (e.g., Erwin 2002; Krug et al. 2017), establishing 2017; Brugger et al. 2017). Over 60% of Cret- today’s biogeographic patterns, in part, as the aceous species became extinct, making the legacy of a globally heterogeneous extinction Cretaceous–Paleogene (K/Pg) event the most (e.g., Wolfe 1987). recent of the “big five” mass extinctions (Raup Southern Hemisphere records of calcareous and Sepkoski 1982; Jablonski 2005; Schulte nannoplankton, insect herbivory, and terrestrial © The Author(s), 2020. Published by Cambridge University Press on behalf of The Paleontological Society. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/ licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. 0094-8373/20 Downloaded from http://pubs.geoscienceworld.org/paleobiol/article-pdf/46/4/445/5188412/s0094837320000457a.pdf by guest on 25 September 2021 446 ELENA STILES ET AL. palynomorphs indicate lower extinction and/ Zealand revealed a dramatic floral turnover or faster recoveries than Northern Hemisphere (Pole and Vajda 2009) and a paleoclimatic cool- counterparts (Vajda et al. 2001; Vajda and ing trend consistent with global records (Ken- Raine 2003; Iglesias et al. 2007; Pole and Vajda nedy et al. 2002) across the K/Pg, but the 2009; Jiang et al. 2010; Barreda et al. 2012; Can- severity of the macrofloral extinction was not trill and Poole 2012; Schueth et al. 2015; Dono- estimated. Until now, no well-constrained and van et al. 2016). Furthermore, several plant and well-sampled macrofloral Maastrichtian and vertebrate groups that had been known only Danian sites from the same region have been from Mesozoic localities in the Northern Hemi- available in the Southern Hemisphere. sphere, have been reported in Cenozoic South- Recent studies of the latest Cretaceous (Maas- ern Hemisphere deposits suggesting that they trichtian) Lefipán and early Paleocene (Danian) survived the K/Pg in southern latitudes (Case Salamanca and Peñas Coloradas Formations of and Woodburne 1986; Pascual et al. 1992; Bona- Chubut, Argentine Patagonia (Fig. 1; and see parte et al. 1993; Goin et al. 2006, 2012; “Materials” and “Analytical Methods”) showed McLoughlin et al. 2008, 2011; Gelfo et al. lower palynological extinction, faster recovery 2009; Sterli and de la Fuente 2019). Proposed of insect herbivory damage-type diversity, and explanations for this geographic heterogeneity remarkably diverse Danian macrofloras com- (Jiang et al. 2010; Donovan et al. 2016, 2018) pared with most NAM sections of the same have referenced increased distance from the ages. Specifically, spore and pollen records Mexican impact site (Schulte et al. 2010), showed <10% extinction across the K/Pg com- oceanic buffering of impact winter tempera- pared with the 30%–40% extinction in NAM tures in the Southern Hemisphere (Bardeen palynofloras (Nichols and Fleming 1990; et al. 2017; Tabor et al. 2020), and a bolide Sweet and Braman 2001; Hotton 2002; Nichols impact angle that would have directed most 2002; Barreda et al. 2012). Notably, in early ejecta and debris northward (Schultz and Danian Patagonian pollen records, an abun- D’Hondt 1996). dance spike of the conifer Classopollis represents Because plants are the primary producers in the last record of a genus that is otherwise only terrestrial ecosystems and one of the most bio- known until the Late Cretaceous worldwide diverse groups of organisms, the paleobotan- (Barreda et al. 2012). Insect feeding-damage ical record is critical for understanding types on angiosperm leaves recovered to extinction events on land (e.g., Nichols and pre-K/Pg diversity levels within about 4 Myr, Johnson 2008). However, the vast majority of compared with the estimated ca. 9 Myr for plant-bearing K/Pg continental sites is concen- NAM (Donovan et al. 2016, 2018), and Danian trated in the western interior of North America macrofloras of the Salamanca Formation are (NAM), which bears numerous examples of much more diverse than most coeval NAM stratigraphically and temporally well con- counterparts, suggesting a faster-paced Patago- strained boundary-spanning palynofloras nian recovery (Iglesias et al. 2007). However, (e.g., Nichols et al. 1986; Nichols and Fleming comparable Maastrichtian leaf floras from the 1990; Sweet et al. 1990, 1999; Sweet and Braman same Patagonian region have not yet been eval- 2001; Nichols 2002; Bercovici et al. 2009) and uated using similar methods. macrofloras (e.g., Wolfe and Upchurch 1986; Gymnosperm macrofossils of the Lefipán Johnson et al. 1989; Johnson and Hickey 1990; and Salamanca Formations have been the sub- Johnson 1992, 2002; Upchurch 1995; Barclay ject of taxonomic studies (Zamuner et al. et al. 2003; Nichols and Johnson 2008). South- 2000; Brea et al. 2005; Quiroga et al. 2015; ern Hemisphere K/Pg-spanning paleofloras Ruiz et al. 2017; Wilf et al. 2017; Andruchow- are scarce and have been primarily limited to Colombo et al. 2018, 2019; Escapa et al. 2018), palynological records (e.g., Vajda-Santivanez indicating the survival of the Podocarpaceae 1999; Vajda et al. 2001; Vajda and Raine 2003; and Araucariaceae conifer families. The pres- Pole and Vajda 2009; Barreda et al. 2012; Can- ence of several derived angiosperm groups trill and Poole 2012; Scasso et al. 2020). Cret- known from reproductive material in the Sala- aceous–Paleogene macrofloras from New manca Formation suggests that they also Downloaded from http://pubs.geoscienceworld.org/paleobiol/article-pdf/46/4/445/5188412/s0094837320000457a.pdf by guest on 25 September 2021 PATAGONIAN K/PG PLANT EXTINCTION 447 represent K/Pg survivor families (Iglesias et al. et al. (2007) documented Danian dicot-leaf 2007; Raigemborn
Load more

Recommended publications
  • Chapter SR a SUMMARY of TERTIARY COAL RESOURCES OF
    Chapter SR A SUMMARY OF TERTIARY COAL RESOURCES OF THE RATON BASIN, COLORADO AND NEW MEXICO By R.M. Flores and L.R. Bader in U.S. Geological Survey Professional Paper 1625-A Contents Introduction...........................................................................................................................SR-1 Stratigraphy...........................................................................................................................SR-2 Depositional Environments...............................................................................................SR-5 Description of Coal Zones.................................................................................................SR-7 Coal Quality..........................................................................................................................SR-9 Original Resources............................................................................................................SR-12 Production History............................................................................................................SR-13 Coal-bed Methane..............................................................................................................SR-15 Conclusions.........................................................................................................................SR-17 References...........................................................................................................................SR-19 Figures SR-1. Map showing the geology
    [Show full text]
  • Rare Earth Occurrences Proximal to the Cretaceous/Tertiary Boundary in the Raton Basin, South-Central Colorado*
    Rare Earth Occurrences Proximal to the Cretaceous/Tertiary Boundary in the Raton Basin, South-central Colorado* Dr. H.T.Andersen1, Dr. Rex Bryan2, Mr. Thomas Gray3, & Dr. Dave Richers4 *Presented at the AiChe Conference, November 8-13, 2015, Salt Lake City, Utah 1 Digitus International, Golden, CO. 2 Tetra Tech, Inc., Golden, CO. 3 Tetra Tech, Inc., Golden, CO Abstract The Raton Coal Basin of Colorado and New Mexico is one of the premier coal basins where the Cretaceous/Tertiary boundary can be viewed and samples of coals, tonsteins, and shaly materials proximal to this 1 boundary can be readily obtained. Near Trinidad, CO, extensive coal deposits exist that straddle this boundary. Further, the presence of near-by igneous features such as the Sangre de Cristo Mountains and associated dikes and sills provide a possible source of anomalous geochemical features found in the coals. Reconnaissance geochemical investigations utilizing a hand-held X-Ray Fluorescence Spectrometer (XRF) indicate that appreciable amounts of Ti, Zr, Y, and light rare-earth elements (REE) are present within the coals and coal partings near the boundary of the Cretaceous Vermejo Formation and the overlying Tertiary Raton Formation. In some instances, semi-quantitative determinations indicate elevated quantities of Y and light REE (hundreds of parts per million) are present in select raw coal samples in the area. Earlier studies of the REE content of coal samples in the basin were conducted by the USGS and presented in their CoalQual database. The results of the XRF spectroscopy corroborates the findings reported in that database. Altered kaolinitic pyroclastic ash is present in the basin that is interpreted to be in- part sourced from the Cretaceous/Tertiary (K-T) impact.
    [Show full text]
  • Magmatic Evolution and Petrochemistry of Xenoliths Contained Within an Andesitic Dike of Western Spanish Peak, Colorado
    Magmatic Evolution and Petrochemistry of Xenoliths contained within an Andesitic Dike of Western Spanish Peak, Colorado Thesis for Departmental Honors at the University of Colorado Ian Albert Rafael Contreras Department of Geological Sciences Thesis Advisor: Charles Stern | Geological Sciences Defense Committee: Charles Stern | Geological Sciences Rebecca Flowers | Geological Sciences Ilia Mishev | Mathematics April the 8th 2014 Magmatic Evolution and Petrochemistry of Xenoliths contained within an Andesitic Dike of Western Spanish Peak, Colorado Ian Albert Rafael Contreras Department of Geological Sciences University of Colorado Boulder Abstract The Spanish Peaks Wilderness of south-central Colorado is a diverse igneous complex which includes a variety of mid-Tertiary intrusions, including many small stocks and dikes, into Cretaceous and early Tertiary sediments. The focus of this thesis is to determine whether gabbroic xenoliths found within an andesitic dike on Western Spanish Peak were accidental or cognate, and their implications for the magma evolution of the area. A total of twelve samples were collected from a single radial dike, eleven of which were sliced into thin sections for petrological analyses. From the cut thin sections, six were chosen for electron microprobe analysis to determine mineral chemistry, and billets of ten samples were subject to ICP-MS analysis to determine bulk rock, trace element chemistry. Xenoliths were dominated by amphiboles, plagioclase feldspars, clinopyroxenes and opaques (Fe-Ti oxides) distributed in mostly porphyritic to equigranular textures. Pargasitic and kaersutitic amphiboles are present in both the xenoliths and the host dike. Additionally, plagioclase feldspars range from albite to labradorite, and clinopyroxenes range from augite to diopside. All xenoliths were found to be enriched in elements Ti, Sr, Cr and Mn compared to the host dike and other Spanish Peak radial dikes.
    [Show full text]
  • Igneous Intrusions and Thermal Evolution in the Raton Basin, Co-Nm: Contact Metamorphism and Coal-Bed Methane Generation
    IGNEOUS INTRUSIONS AND THERMAL EVOLUTION IN THE RATON BASIN, CO-NM: CONTACT METAMORPHISM AND COAL-BED METHANE GENERATION A Thesis presented to the Faculty of the Graduate School University of Missouri-Columbia ____________________________________ In Partial Fulfillment Of the Requirements for the Degree Masters of Science _________________________________ by JENNIFER REBECCA COOPER Dr. Alan Whittington, Thesis Supervisor MAY 2006 The undersigned, appointed by the Dean of the Graduate School, have examined the thesis entitled: IGNEOUS INTRUSIONS AND THERMAL EVOLUTION IN THE RATON BASIN, CO-NM: CONTACT METAMORPHISM AND COAL- BED METHANE GENERATION Presented by Jennifer Rebecca Cooper A candidate for the degree of Master of Science A hereby certify that in their opinion it is worthy of acceptance. _____________________________ Alan Whittington _____________________________ Peter Nabelek _____________________________ Steven Keller ACKNOWLEDGEMENTS So many people have helped with this project by providing laboratory assistance, instruction and encouragement. These include William Huggett and Dr. Jack Crelling of Southern Illinois University and Dr. Sue Rimmer of the University of Kentucky-Lexington. Access to these laboratories was essential to this project. AAPG’s Energy-Minerals graduate student research grant and GSA’s Coal Division Annette Medlin Award provided funding for this research. Thanks to a GSA Graduate Student Research grant that provided funding for investigation of xenolith dissolution. Thanks to the MU Research Council and the University of Missouri Research Board for funding. Thank you to Gus Holmes and Rich Larsen at the Vermejo Park. Both were helpful in providing land access and information about the geology of the park. Thanks to the NRA for land access. Thank you to Brad Joliff and Gretchen Benedix at Washington University for assistance with the electron microprobe.
    [Show full text]
  • Structural Framework of the Southern Raton Basin, New Mexico Lee A
    New Mexico Geological Society Downloaded from: http://nmgs.nmt.edu/publications/guidebooks/27 Structural framework of the southern Raton Basin, New Mexico Lee A. Woodward and D. O. Snyder, 1976, pp. 125-127 in: Vermejo Park, Ewing, R. C.; Kues, B. S.; [eds.], New Mexico Geological Society 27th Annual Fall Field Conference Guidebook, 306 p. This is one of many related papers that were included in the 1976 NMGS Fall Field Conference Guidebook. Annual NMGS Fall Field Conference Guidebooks Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscience papers. These books have set the national standard for geologic guidebooks and are an essential geologic reference for anyone working in or around New Mexico. Free Downloads NMGS has decided to make peer-reviewed papers from our Fall Field Conference guidebooks available for free download. Non-members will have access to guidebook papers two years after publication. Members have access to all papers. This is in keeping with our mission of promoting interest, research, and cooperation regarding geology in New Mexico. However, guidebook sales represent a significant proportion of our operating budget. Therefore, only research papers are available for download. Road logs, mini-papers, maps, stratigraphic charts, and other selected content are available only in the printed guidebooks. Copyright Information Publications of the New Mexico Geological Society, printed and electronic, are protected by the copyright laws of the United States.
    [Show full text]
  • Co-Raton-Mesa-Nm.Pdf
    D-5 I I I~ ..--- ~..,.....----~__O~~--- I I I UNITED STATES DEPARTMENT OF THE INTERIOR NATIONAL SE I I I I II I Cover painting "FISHERS PEAK" by Arthur Roy Mitchell, commissioned for the Denver Post's Collection of Western Art, reproduced through the courtesy of Palmer Hoyt, Editor. I I.1 I I SYNOPSIS NOT FOR FU~LIC l{ELEASJ Raton Mesa near Trinidad, Colorado, about 200 miles south of Denver, I is the highest, most scenic, impressive and accessible of a scattered group of lava-capped mesas straddling the eastern half of the Colorado- I New Mexico boundary. It and its highest part, Fishers Peak, are well I known landmarks dating back to the days of the Santa Fe Trail which~ traverses Raton Pass on its southwest flank, today crossed by an interstate high- I way. Three distinct, easily recognized vegetative zones, mostly forest, lay on its slopes; the Mesa top is a high mountain grassland. I Ancient lava flows covered portions of this region, the Raton I section of the Great Plains physiographic province, millions of years ago when the surface was much higher. These flows protected the mesas from subsequent erosion which has carried away the surrounding territory, • leaving Fishers Peak today towering 4,000 feet above the City of Trinidad. I Lavas at Capulin Mountain, a National Monument located nearby in New I Mexico, though at a lower elevation, are thought to be much more recent. Raton Pass was a strategic point on the Mountain Branch of the I Santa Fe Trail during the Mexican and Civil Wars, and to travelers past and present a clima~~ gateway to the southwest.
    [Show full text]
  • New Mexico's Raton Basin Coalbed Methane Play
    New Mexico’s Raton Basin coalbed methane play Gretchen K. Hoffman and Brian S. Brister, New Mexico Bureau of Geology and Mineral Resources, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801 Abstract Bureau of Geology and Mineral Resources. drainage efficiency, and their potential eco- There is also a significant body of data and nomic viability. There are restrictions on The Raton Basin became New Mexico’s literature devoted to the coal resources of the number of wells that can be drilled per newest natural gas-producing region in 1999 the region stored at the bureau’s Coal square mile in coalbed methane develop- when a new pipeline allowed production of Library. For this paper we reviewed this ment. Therefore, data and literature origi- coalbed methane near Vermejo Park, west of Raton. As of May 2003, 256 wells had been public data set with the intent to update nally designed to describe and support drilled and completed, producing more than and summarize what is known about the coal mining can be a valuable resource in 22 billion cubic feet of coalbed methane from coal-bearing formations and their associat- understanding and developing emerging coals in the Upper Cretaceous to Paleocene ed methane production. coalbed methane plays like the Raton Vermejo and Raton Formations. Less than Basin. half of the prospective area as delimited by Basin structure The Raton coal field is defined as the the presence of thermally mature coal has New Mexico portion of the Raton Basin been developed. An extensive geologic data Baltz (1965) provided a thorough descrip- including Upper Cretaceous and Pale- set exists at the New Mexico Bureau of Geol- ocene coal-bearing sequences in the Ver- ogy and Mineral Resources including infor- tion of the Raton structural basin, para- mation from coal mining and coalbed phrased here.
    [Show full text]
  • A Possible Causative Mechanism of Raton Basin, New Mexico and Colorado Earthquakes Using Recent Seismicity Patterns and Pore Pressure Modeling
    A possible causative mechanism of Raton Basin, New Mexico and Colorado earthquakes using recent seismicity patterns and pore pressure modeling J.S. Nakai,1,2, M. Weingarten3, A.F. Sheehan1,2, S.L. Bilek4, S. Ge1 1 Department of Geological Sciences, University of Colorado Boulder, 399 UCB, Boulder, CO, 80309 2 Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, 216 UCB, Boulder, CO, 80309 3 Department of Geophysics, Stanford University, Stanford, CA, 94301 4 Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro NM, 87801 Corresponding Author: Jenny Nakai ([email protected]) Key Points: We infer a 20 km long Vermejo Park fault from seismicity that shows pore pressure changes of 0.08 MPa by 2008 Pore pressure modeling shows changes up to 0.50 MPa, despite an underpressured disposal interval not in direct contact with the basement The number of earthquakes and cumulative volume of wastewater injected are correlated for wells within 5, 10, and 15 km of seismicity This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/2017JB014415 © 2017 American Geophysical Union. All rights reserved. Abstract The Raton Basin has the highest number of earthquakes in Colorado and New Mexico from 2008 to 2010. The rate of both wastewater injection and earthquakes in the Basin increased dramatically starting in 1999 and 2000, respectively.
    [Show full text]
  • The Cretaceous-Tertiary Boundary in the Raton Basin, New Mexico and Colorado Charles L
    New Mexico Geological Society Downloaded from: http://nmgs.nmt.edu/publications/guidebooks/41 The Cretaceous-Tertiary boundary in the Raton Basin, New Mexico and Colorado Charles L. Pillmore and R. Farley Fleming, 1990, pp. 327-331 in: Tectonic Development of the Southern Sangre de Cristo Mountains, New Mexico, Bauer, P. W.; Lucas, S. G.; Mawer, C. K.; McIntosh, W. C.; [eds.], New Mexico Geological Society 41st Annual Fall Field Conference Guidebook, 450 p. This is one of many related papers that were included in the 1990 NMGS Fall Field Conference Guidebook. Annual NMGS Fall Field Conference Guidebooks Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscience papers. These books have set the national standard for geologic guidebooks and are an essential geologic reference for anyone working in or around New Mexico. Free Downloads NMGS has decided to make peer-reviewed papers from our Fall Field Conference guidebooks available for free download. Non-members will have access to guidebook papers two years after publication. Members have access to all papers. This is in keeping with our mission of promoting interest, research, and cooperation regarding geology in New Mexico. However, guidebook sales represent a significant proportion of our operating budget. Therefore, only research papers are available for download. Road logs, mini-papers, maps, stratigraphic charts, and other selected content are available only in the printed guidebooks.
    [Show full text]
  • Geology of the Igneous Rocks of the Spanish Peaks Region Colorado
    Geology of the Igneous Rocks of the Spanish Peaks Region Colorado GEOLOGICAL SURVEY PROFESSIONAL PAPER 594-G GEOLOGY OF THE IGNEOUS ROCKS OF THE SPANISH PEAKS REGION, COLORADO The Spanish Peaks (Las Cumbres Espanolas). Geology of the Igneous Rocks of the Spanish Peaks Region Colorado By ROSS B. JOHNSON SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY GEOLOGICAL SURVEY PROFESSIONAL PAPER 594-G A study of the highly diverse igneous rocks and structures of a classic geologic area, with a discussion on the emplacement of these features UNITED STATES GOVERNl\1ENT PRINTING OFFICE, WASHINGTON : 1968 UNITED STATES DEPARTMENT OF THE INTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY William T. Pecora, Director For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 CONTENTS Page Page Abstract__________________________________________ _ G1 Petrography-Continued Introduction ______________________________________ _ 1 Syenite_______________________________________ _ G19 Geologic setting ___________________________________ _ 3 Porphyry _________________________________ _ 19 General features _______________________________ _ 3 Aphanite---------------------------------- 20 Sedhnentaryrocks _____________________________ _ 4 Lamprophyre _____________________________ _ 20 Structure _____________________________________ _ 4 Syenodiorite __________________________________ _ 22 Thrust and reverse faults ___________________ _ 5 Phanerite_________________________________ _ 22 Normal faults _____________________________
    [Show full text]
  • Hydraulic Retrospective Case Study, Raton Basin, CO
    GWERD QUALITY ASSURANCE PROJECT PLAN Title: Hydraulic Fracturing Retrospective Case Study, Raton Basin, CO TASK No. 26278 QA ID No. G-16642 QA Category: 1 HF Project #13 Original QAPP submitted: 8/30/2011 Number of Pages: 94 Revision No: 1 (submitted April 9, 2012) (see p. 46 for Revision History) /s/ 4/30/2012 __________________________________________ ______________ Richard Wilkin, Principal Investigator Date APPROVALS: /s/ 4/30/2012 __________________________________________ ______________ Dominic DiGiulio, Branch Chief Date /s/ 4/30/2012 __________________________________________ ______________ David Jewett, Technical Research Lead for Case Studies Date /s/ 4/30/2012 __________________________________________ ______________ Steve Vandegrift, GWERD QA Manager Date Distribution List: Russell Neill, EPA/ORD/NRMRL/GWERD Carl Miller, EPA/ORD/NRMRL/GWERD Amy Wolfe, EPA/ORD/NRMRL/GWERD Zell Peterman, U.S. Geological Survey Tony Lee, EPA/ORD/NRMRL/GWERD Alex Kirkpatrick, Student Contractor Steve Acree, EPA/ORD/NRMRL/GWERD Cherri Adair, EPA/ORD/NRMRL/GWERD Randall Ross, EPA/ORD/NRMRL/GWERD Mark White, EPA/ORD/NRMRL/GWERD Sujith Kumar, Shaw Environmental Jorge Santo Domingo, EPA/ORD/NRMRL Shauna Bennett, Shaw QC Coordinator* Cynthia Caporale, EPA Region 3 Gregory Oberley, EPA Region 8 Mark Burkhardt, EPA Region 8 *will distribute to Shaw staff EPA does not consider this internal planning document an official Agency dissemination of information under the Agency's Information Quality Guidelines, because it is not being used to formulate or support a regulation or guidance; or to represent a final Agency decision or position. This planning document describes the quality assurance/quality control activities and technical requirements that will be used during the research study.
    [Show full text]
  • Late Cretaceous and Tertiary Stratigraphy of the Raton Basin of New Mexico and Colorado Ross B
    New Mexico Geological Society Downloaded from: http://nmgs.nmt.edu/publications/guidebooks/17 Late Cretaceous and Tertiary stratigraphy of the Raton basin of New Mexico and Colorado Ross B. Johnson, G. H. Dixon, and A. A. Wanek, 1966, pp. 88-98 in: Taos-Raton-Spanish Peaks Country (New Mexico and Colorado), Northrop, S. A.; Read, C. B.; [eds.], New Mexico Geological Society 17th Annual Fall Field Conference Guidebook, 128 p. This is one of many related papers that were included in the 1966 NMGS Fall Field Conference Guidebook. Annual NMGS Fall Field Conference Guidebooks Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscience papers. These books have set the national standard for geologic guidebooks and are an essential geologic reference for anyone working in or around New Mexico. Free Downloads NMGS has decided to make peer-reviewed papers from our Fall Field Conference guidebooks available for free download. Non-members will have access to guidebook papers two years after publication. Members have access to all papers. This is in keeping with our mission of promoting interest, research, and cooperation regarding geology in New Mexico. However, guidebook sales represent a significant proportion of our operating budget. Therefore, only research papers are available for download. Road logs, mini-papers, maps, stratigraphic charts, and other selected content are available only in the printed guidebooks.
    [Show full text]