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Tectonic Imbrication and Foredeep Development in the Penokean
Tectonic Imbrication and Foredeep Development in the Penokean Orogen, East-Central Minnesota An Interpretation Based on Regional Geophysics and the Results of Test-Drilling The Penokean Orogeny in Minnesota and Upper Michigan A Comparison of Structural Geology U.S. GEOLOGICAL SURVEY BULLETIN 1904-C, D AVAILABILITY OF BOOKS AND MAPS OF THE U.S. GEOLOGICAL SURVEY Instructions on ordering publications of the U.S. Geological Survey, along with prices of the last offerings, are given in the cur rent-year issues of the monthly catalog "New Publications of the U.S. Geological Survey." Prices of available U.S. Geological Sur vey publications released prior to the current year are listed in the most recent annual "Price and Availability List." Publications that are listed in various U.S. Geological Survey catalogs (see back inside cover) but not listed in the most recent annual "Price and Availability List" are no longer available. Prices of reports released to the open files are given in the listing "U.S. Geological Survey Open-File Reports," updated month ly, which is for sale in microfiche from the U.S. Geological Survey, Books and Open-File Reports Section, Federal Center, Box 25425, Denver, CO 80225. Reports released through the NTIS may be obtained by writing to the National Technical Information Service, U.S. Department of Commerce, Springfield, VA 22161; please include NTIS report number with inquiry. Order U.S. Geological Survey publications by mail or over the counter from the offices given below. BY MAIL OVER THE COUNTER Books Books Professional Papers, Bulletins, Water-Supply Papers, Techniques of Water-Resources Investigations, Circulars, publications of general in Books of the U.S. -
Timeline of Natural History
Timeline of natural history This timeline of natural history summarizes significant geological and Life timeline Ice Ages biological events from the formation of the 0 — Primates Quater nary Flowers ←Earliest apes Earth to the arrival of modern humans. P Birds h Mammals – Plants Dinosaurs Times are listed in millions of years, or Karo o a n ← Andean Tetrapoda megaanni (Ma). -50 0 — e Arthropods Molluscs r ←Cambrian explosion o ← Cryoge nian Ediacara biota – z ←Earliest animals o ←Earliest plants i Multicellular -1000 — c Contents life ←Sexual reproduction Dating of the Geologic record – P r The earliest Solar System -1500 — o t Precambrian Supereon – e r Eukaryotes Hadean Eon o -2000 — z o Archean Eon i Huron ian – c Eoarchean Era ←Oxygen crisis Paleoarchean Era -2500 — ←Atmospheric oxygen Mesoarchean Era – Photosynthesis Neoarchean Era Pong ola Proterozoic Eon -3000 — A r Paleoproterozoic Era c – h Siderian Period e a Rhyacian Period -3500 — n ←Earliest oxygen Orosirian Period Single-celled – life Statherian Period -4000 — ←Earliest life Mesoproterozoic Era H Calymmian Period a water – d e Ectasian Period a ←Earliest water Stenian Period -4500 — n ←Earth (−4540) (million years ago) Clickable Neoproterozoic Era ( Tonian Period Cryogenian Period Ediacaran Period Phanerozoic Eon Paleozoic Era Cambrian Period Ordovician Period Silurian Period Devonian Period Carboniferous Period Permian Period Mesozoic Era Triassic Period Jurassic Period Cretaceous Period Cenozoic Era Paleogene Period Neogene Period Quaternary Period Etymology of period names References See also External links Dating of the Geologic record The Geologic record is the strata (layers) of rock in the planet's crust and the science of geology is much concerned with the age and origin of all rocks to determine the history and formation of Earth and to understand the forces that have acted upon it. -
Detrital Zircon Provenance and Lithofacies Associations Of
geosciences Article Detrital Zircon Provenance and Lithofacies Associations of Montmorillonitic Sands in the Maastrichtian Ripley Formation: Implications for Mississippi Embayment Paleodrainage Patterns and Paleogeography Jennifer N. Gifford 1,*, Elizabeth J. Vitale 1, Brian F. Platt 1 , David H. Malone 2 and Inoka H. Widanagamage 1 1 Department of Geology and Geological Engineering, University of Mississippi, Oxford, MS 38677, USA; [email protected] (E.J.V.); [email protected] (B.F.P.); [email protected] (I.H.W.) 2 Department of Geography, Geology, and the Environment, Illinois State University, Normal, IL 61790, USA; [email protected] * Correspondence: jngiff[email protected]; Tel.: +1-(662)-915-2079 Received: 17 January 2020; Accepted: 15 February 2020; Published: 22 February 2020 Abstract: We provide new detrital zircon evidence to support a Maastrichtian age for the establishment of the present-day Mississippi River drainage system. Fieldwork conducted in Pontotoc County,Mississippi, targeted two sites containing montmorillonitic sand in the Maastrichtian Ripley Formation. U-Pb detrital zircon (DZ) ages from these sands (n = 649) ranged from Mesoarchean (~2870 Ma) to Pennsylvanian (~305 Ma) and contained ~91% Appalachian-derived grains, including Appalachian–Ouachita, Gondwanan Terranes, and Grenville source terranes. Other minor source regions include the Mid-Continent Granite–Rhyolite Province, Yavapai–Mazatzal, Trans-Hudson/Penokean, and Superior. This indicates that sediment sourced from the Appalachian Foreland Basin (with very minor input from a northern or northwestern source) was being routed through the Mississippi Embayment (MSE) in the Maastrichtian. We recognize six lithofacies in the field areas interpreted as barrier island to shelf environments. Statistically significant differences between DZ populations and clay mineralogy from both sites indicate that two distinct fluvial systems emptied into a shared back-barrier setting, which experienced volcanic ash input. -
The Geology of the Middle Precambrian Rove Formation in Northeastern Minnesota
MINNESOTA GEOLOGICAL SURVEY 5 P -7 Special Publication Series The Geology of the Middle Precambrian Rove Formation in northeastern Minnesota G. B. Morey UNIVERSITY OF MINNESOTA MINNEAPOLIS • 1969 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I THE GEOLOGY OF THE MIDDLE PRECAMBRIAN ROVE FORMATION IN NORTHEASTERN MINNESOTA by G. B. Morey CONTENTS Page Abstract ........................................... 1 Introduction. 3 Location and scope of study. 3 Acknowledgements .. 3 Regional geology . 5 Structural geology . 8 Rock nomenclature . 8 Stratigraphy . .. 11 Introduction . .. 11 Nomenclature and correlation. .. 11 Type section . .. 11 Thickness . .. .. 14 Lower argillite unit. .. 16 Definition, distribution, and thickness. .. 16 Lithologic character . .. 16 Limestones. .. 17 Concretions. .. 17 Transition unit . .. 17 Definition, distribution, and thickness. .. 17 Lithologic character . .. 19 Thin-bedded graywacke unit . .. 19 Definition, distribution, and thickness. .. 19 Lithologic character. .. 20 Concretions ... .. 20 Sedimentary structures. .. 22 Internal bedding structures. .. 22 Structureless bedding . .. 23 Laminated bedding . .. 23 Graded bedding. .. 23 Cross-bedding . .. 25 Convolute bedding. .. 26 Internal bedding sequences . .. 26 Post-deposition soft sediment deformation structures. .. 27 Bed pull-aparts . .. 27 Clastic dikes . .. 27 Load pockets .. .. 28 Flame structures . .. 28 Overfolds . .. 28 Microfaults. .. 28 Ripple marks .................................. 28 Sole marks . .. 28 Groove casts . .. 30 Flute casts . -
Joe Curran Microfossils and the Depositional Environment of The
Joe Curran Microfossils and the Depositional Environment of the Gunflint Iron Formation A thesis submitted in partial fulfillment of the requirements for the degree of Bachelor of Arts (Geology) at GUSTAVUS ADOLPHUS COLLEGE 2012 Abstract The Gunflint Iron Formation was deposited during the mid-Paleoproterozoic, shortly after the early Paleoproterozoic Great Oxygenation Event(GOE), when the atmosphere and oceans became oxygenated for the first time. The lowermost portions of the Gunflint Iron Formation contain black, early diagenetic chert with locally abundant microfossils. Reconstructing the life habits and ecology of the microfossil assemblages allows us to better understand the shallow water sedimantary conditions during the post GOE interval. Eosphaera and Kakabekia are two distinctive genera that occur in the Gunflint, but they likely had different habitats. Kakabekia has a morphology similar to iron metabolizing bacteria that live today in anoxic soil microhabitats. In the Gunflint, Kakabekia occurs in association with filamehts and coccoidal microfossils that likely lived in or near stromatolites on the sea floor. The association with this likely iron bacteria and a benthic microbial community suggests that most of the Gunflint microflora was benthic and possibly living in ferruginous, anoxic conditions. In contrast, Eosphaera fossils are rare and not strongly associated with the main community components. Eosphaera’s morphological similarity with the modern alga Volvox suggests that Eosphaera may also have hada photosynthetic metabolism. Eosphaera is plausibly interpreted as an oxygenic photosyhthesizer that lived in an oxic zone above the seafloor. If correct, this interpretation suggests close spatial proximity of oxic and anoxic environments in the Paleoproterozoic iron formations. -
Driftless Area National Wildlife Refuge
DRIFTLESS AREA NATIONAL WILDLIFE REFUGE McGregor, Iowa ANNUAL NARRATIVE REPORT FY2006 DRIFTLESS AREA NATIONAL WILDLIFE REFUGE McGregor, Iowa Fiscal Year 2006 _________________________ Prepared by Date _________________________ ______________________________ Refuge Manager Date Complex Manager Date ______________________________ Regional Chief, NWRS Date INTRODUCTION 1. Location The Driftless Area National Wildlife Refuge was established in 1989 for the protection and recovery of the threatened Northern monkshood and endangered Iowa Pleistocene snail. These species occur on a rare habitat type termed algific talus slopes. These are slopes with outflows of cold underground air that provide a glacial relict habitat to which certain species have adapted (see diagram below). The Driftless Area National Wildlife Refuge consists of ten units scattered throughout Allamakee, Clayton, Dubuque, and Jackson Counties in northeast Iowa. Total Refuge acreage is 811 acres with individual units ranging from 6 to 208 acres. Acquisition targets not only the algific slope, but surrounding buffer habitat that includes sinkholes important to air flow to the slope. Acquisition is ongoing, but limited due to insufficient funds. 2. Topography Refuge units are primarily forested and generally consist of steep topography with narrow creek valleys, large rock outcroppings, and karst features. Riparian and grassland habitat also occur on the Refuge. 3. Points of Interest The algific talus slope habitat of the Refuge harbors many unusual and rare plant and land snail species, some of which are also on the state threatened and endangered species list. These areas tend to be scenic with cliffs and rock outcroppings, springs, and coldwater streams. 4. Physical Facilities The Refuge office is located at the McGregor District of the Upper Mississippi River National Wildlife and Fish Refuge, McGregor, Iowa. -
A Stable Isotopic Investigation of Resource Partitioning Among Neosauropod Dinosaurs of the Upper Jurassic Morrison Formation
A stable isotopic investigation of resource partitioning among neosauropod dinosaurs of the Upper Jurassic Morrison Formation Benjamin T. Breeden, III SID: 110305422 [email protected] GEOL394H University of Maryland, College Park, Department of Geology 29 April 2011 Advisors: Dr. Thomas R. Holtz1, Jr., Dr. Alan Jay Kaufman1, and Dr. Matthew T. Carrano2 1: University of Maryland, College Park, Department of Geology 2: National Museum of Natural History, Department of Paleobiology ABSTRACT For more than a century, morphological studies have been used to attempt to understand the partitioning of resources in the Morrison Fauna, particularly between members of the two major clades of neosauropod (long-necked, megaherbivorous) dinosaurs: Diplodocidae and Macronaria. While it is generally accepted that most macronarians fed 3-5m above the ground, the feeding habits of diplodocids are somewhat more enigmatic; it is not clear whether diplodocids fed higher or lower than macronarians. While many studies exploring sauropod resource portioning have focused on differences in the morphologies of the two groups, few have utilized geochemical evidence. Stable isotope geochemistry has become an increasingly common and reliable means of investigating paleoecological questions, and due to the resistance of tooth enamel to diagenetic alteration, fossil teeth can provide invaluable paleoecological and behavioral data that would be otherwise unobtainable. Studies in the Ituri Rainforest in the Democratic Republic of the Congo, have shown that stable isotope ratios measured in the teeth of herbivores reflect the heights at which these animals fed in the forest due to isotopic variation in plants with height caused by differences in humidity at the forest floor and the top of the forest exposed to the atmosphere. -
A Reappraisal of Mississippian (Tournaisian and Visean) Adpression Floras from Central and Northwestern Europe
Zitteliana A 54 (2014) 39 A reappraisal of Mississippian (Tournaisian and Visean) adpression floras from central and northwestern Europe Maren Hübers1, Benjamin Bomfleur2*, Michael Krings3, Christian Pott2 & Hans Kerp1 1Forschungsstelle für Paläobotanik am Geologisch-Paläontologischen Institut, Westfälische Zitteliana A 54, 39 – 52 Wilhelms-Universität Münster, Heisenbergstraße 2, 48149 Münster, Germany München, 31.12.2014 2Swedish Museum of Natural History, Department of Paleobiology, Box 50007, SE-104 05, Stockholm, Sweden Manuscript received 3Department für Geo- und Umweltwissenschaften, Paläontologie und Geobiologie, Ludwig- 01.02.2014; revision Maximilians-Universität, and Bayerische Staatssammlung für Paläontologie und Geologie, Richard- accepted 07.04.2014 Wagner-Straße 10, 80333 Munich, Germany ISSN 1612 - 412X *Author for correspondence and reprint requests: E-mail: [email protected] Abstract Mississippian plant fossils are generally rare, and in central and northwestern Europe especially Tournaisian to middle Visean fossil floras are restricted to isolated occurrences. While sphenophytes and lycophytes generally are represented by only a few widespread and long-ranging taxa such as Archaeocalamites radiatus, Sphenophyllum tenerrimum and several species of Lepidodendropsis and Lepido- dendron, Visean floras in particular show a remarkably high diversity of fern-like foliage, including filiform types (Rhodea, Diplotmema), forms with bipartite fronds (Sphenopteridium, Diplopteridium, Spathulopteris, Archaeopteridium), others with monopodial, pinnate fronds (Anisopteris, Fryopsis) and still others characterized by several-times pinnate fronds (e.g., Adiantites, Triphyllopteris, Sphenopteris, Neu- ropteris). Most of these leaf types have been interpreted as belonging to early seed ferns, whereas true ferns seem to have been rare or lacking in impression/compression floras. In the upper Visean, two types of plant assemblages can be distinguished, i.e., the northern Kohlenkalk-type and the south-eastern Kulm-type assemblage. -
U Tech Glossary
URGLOSSARY used without permission revised the Ides of March 2014 glos·sa·ry Pronunciation: primarystressglässchwaremacron, -ri also primarystressglodots- Function: noun Inflected Form(s): -es Etymology: Medieval Latin glossarium, from Latin glossa difficult word requiring explanation + -arium -ary : a collection of textual glosses <an edition of Shakespeare with a good glossary> or of terms limited to a special area of knowledge <a glossary of technical terms> or usage <a glossary of dialectal words> Merriam Webster Unabridged tangent, adj. and n. [ad. L. tangens, tangent-em, pr. pple. of tangĕre to touch; used by Th. Fincke, 1583, as n. in sense = L. līnea tangens tangent or touching line. In F. tangent, -e adj., tangente n. (Geom.), Ger. tangente n.] c. In general use, chiefly fig. from b, esp. in phrases (off) at, in, upon a tangent, ie off or away with sudden divergence, from the course or direction previously followed; abruptly from one course of action, subject, thought, etc, to another. (http://dictionary.oed.com) As in off on a tangent. “Practice, repetition, and repetition of the repeated with ever increasing intensity are…the way.” Zen in the Art of Archery by Eugen Herrigel. For many terms, this glossary contains definitions from multiple sources, each with their own nuance, each authors variation emphasized. Reading the repeated definitions, with their slight variations, helps create a fuller, more overall understanding of the meaning of these terms. The etymology of the entries reinforces and may repeat the repetitions. Wax on, wax off. Sand da floor. For sometime, when I encounter a term I don’t understand (and there are very many), I have been looking them up in the oed and copying the definition into a Word document. -
The Joggins Cliffs of Nova Scotia: B2 the Joggins Cliffs of Nova Scotia: Lyell & Co's "Coal Age Galapagos" J.H
GAC-MAC-CSPG-CSSS Pre-conference Field Trips A1 Contamination in the South Mountain Batholith and Port Mouton Pluton, southern Nova Scotia HALIFAX Building Bridges—across science, through time, around2005 the world D. Barrie Clarke and Saskia Erdmann A2 Salt tectonics and sedimentation in western Cape Breton Island, Nova Scotia Ian Davison and Chris Jauer A3 Glaciation and landscapes of the Halifax region, Nova Scotia Ralph Stea and John Gosse A4 Structural geology and vein arrays of lode gold deposits, Meguma terrane, Nova Scotia Rick Horne A5 Facies heterogeneity in lacustrine basins: the transtensional Moncton Basin (Mississippian) and extensional Fundy Basin (Triassic-Jurassic), New Brunswick and Nova Scotia David Keighley and David E. Brown A6 Geological setting of intrusion-related gold mineralization in southwestern New Brunswick Kathleen Thorne, Malcolm McLeod, Les Fyffe, and David Lentz A7 The Triassic-Jurassic faunal and floral transition in the Fundy Basin, Nova Scotia Paul Olsen, Jessica Whiteside, and Tim Fedak Post-conference Field Trips B1 Accretion of peri-Gondwanan terranes, northern mainland Nova Scotia Field Trip B2 and southern New Brunswick Sandra Barr, Susan Johnson, Brendan Murphy, Georgia Pe-Piper, David Piper, and Chris White The Joggins Cliffs of Nova Scotia: B2 The Joggins Cliffs of Nova Scotia: Lyell & Co's "Coal Age Galapagos" J.H. Calder, M.R. Gibling, and M.C. Rygel Lyell & Co's "Coal Age Galapagos” B3 Geology and volcanology of the Jurassic North Mountain Basalt, southern Nova Scotia Dan Kontak, Jarda Dostal, -
091 148-Fritz/Krainer .Indd
ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Carinthia II Jahr/Year: 2007 Band/Volume: 197_117 Autor(en)/Author(s): Fritz Adolf, Krainer Karl Artikel/Article: Vegetationsgeschichtliche und florenstratigraphische Untersuchungen im Oberkarbon und Unterperm der Ost- und Südalpen (Teil 2) 91-148 ©Naturwissenschaftlicher Verein für Kärnten, Austria, download unter www.biologiezentrum.at Carinthia II ■ 197./117. Jahrgang ■ Seiten 91–148 ■ Klagenfurt 2007 91 Vegetationsgeschichtliche und fl orenstratigraphische Untersuchungen im Oberkarbon und Unterperm der Ost- und Südalpen (Teil 2) Von Adolf FRITZ und Karl KRAINER A4a: Der Aufschluss auf der Ofenalm A4: DIE FLOREN Probenaufsammlungen DER CORONA- 21. 07. 1982; 30. 07. 1982; 27. 08. 1982; 07. 08. 1988; 07. 07. 1991; 03. 08. 1991. FORMATION Der Fundpunkt Ofenalm liegt ca. 200 m nordwestlich der Ofenalm am Fußweg (Mittlere zum Garnitzensattel in ca. 1650 m Seehöhe. Die fossilen Pfl anzenreste stammen aus Kalkarme einem graubraunen, siltigen Tonschiefer, der auffallend kleinstückig zerfällt. Die Schichtgruppe) Feinstrukturen der Pfl anzenabdrücke sind in vorzüglicher Qualität erhalten, was dafür spricht, dass die Pfl anzenteile sehr rasch ohne nennenswerten Transport in das Sedi- ment eingebettet wurden. Die geologischen Verhältnisse Der fossilführende Horizont liegt im tieferen Teil der Corona-Forma tion. Die Co- rona-Formation erreicht eine Mächtigkeit von 300 m, ist im tieferen Teil rein klastisch ausgebildet und besteht aus einer Wechselfolge von Siltsteinen mit zwischengeschal- teten Tonschiefern, Sandsteinen und quarzreichen Konglomeraten (Details in KRAINER 1992). Ungefähr 250 m nordwestlich der Fundstelle befi nden sich noch die Halden eines ehemaligen Bergbaues auf Anthrazitkohle. Abgebaut wurden geringmächtige Anthrazitkohlefl öze im tieferen Teil der Corona-Formation. -
Faciès and Biostratigraphy of the Late Carboniferous/Early Permian Sedimentary Séquence in the Carnic Alps (Austria/Ltaly)
Faciès and biostratigraphy of the Late Carboniferous/Early Permian sedimentary séquence in the Carnic Alps (Austria/ltaly) Karl KRAINER Institute for Geology and Paleontology, University of Innsbruck, Innrain 52, A-6020 Innsbruck (Austria) Karl.Krainer® uibk.ac.at Vladimir DAVYDOV Department of Geosciences, Boise State University, 1910 University Drive, Boise, Idaho 83725 (USA) [email protected] In memoriam Franz Kahler (1900-1996) Krainer K. & Davydov V. 1998. — Faciès and biostratigraphy of the Late Carboniferous/Early Permian sedimentary séquence in the Carnic Alps (Austria/ltaly), in Crasquin-Soleau S., Izart A., Vaslet D. & De Wever P. (eds), Peri-Tethys: stratigraphie cor- relations 2, Geodiversitas 20 (4) : 643-662. ABSTRACT The Late Catbonifetous/Early Permian séquence in the Carnic Alps (Austria/ltaly) is a more than 2000 m thick succession of shallow matine clastic and carbonate sedimentaty rocks. The succession unconformably overlies rhe folded Variscan basement and is divided into Bombaso Fotmation, Auernig Group, Rartendotf Group and Trogkofel Group. Auernig Group and Rattendorf Group are charactetized by clastic-catbonate cycles related to Gondwana glacioeustatic sea level changes. Catbonates contain abundant fossils throughout the séquence, biostratigtaphy is mainly based on fusulinids. Fine-grained clastic intervais contain abundant plant fossils, allowing a close corrélation with fluvial succession of the Eastern Alps KEYWORDS (Stangnock Fotmation of the Gutktal Nappe). Fusulinids of the Carnic Alps Peri-Tethys, Late Carboniferous, show high similarity wirh those of the Russian Platfotm, Donets Basin and Early Permian, Ptedonets Trough, Southern Urals and particulatly with Central Asia. Carnic Alps, faciès, Uppermost Moscovian, Kasimovian, Gzhelian, lowermost Asselian, late biostratigraphy, Asselian, Sakmarian and Artinskian équivalents ate established and précise fusulinids, corrélation with sttatotype légions have been completed.