Trace Fossils and Substrates of the Terminal Proterozoic–Cambrian Transition: Implications for the Record of Early Bilaterians and Sediment Mixing
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Decoupled Evolution of Soft and Hard Substrate Communities During the Cambrian Explosion and Great Ordovician Biodiversification Event
Decoupled evolution of soft and hard substrate communities during the Cambrian Explosion and Great Ordovician Biodiversification Event Luis A. Buatoisa,1, Maria G. Mánganoa, Ricardo A. Oleab, and Mark A. Wilsonc aDepartment of Geological Sciences, University of Saskatchewan, Saskatoon, SK, Canada S7N 5E2; bEastern Energy Resources Science Center, US Geological Survey, Reston, VA 20192; and cDepartment of Geology, The College of Wooster, Wooster, OH 44691 Edited by Steven M. Holland, University of Georgia, Athens, GA, and accepted by Editorial Board Member David Jablonski May 6, 2016 (received for review November 21, 2015) Contrasts between the Cambrian Explosion (CE) and the Great shed light on the natures of both radiations. Because there is still Ordovician Biodiversification Event (GOBE) have long been recog- controversy regarding Sepkoski’s nonstandardized curves of nized. Whereas the vast majority of body plans were established Phanerozoic taxonomic diversity (13–15), a rarefaction analysis as a result of the CE, taxonomic increases during the GOBE were was performed in an attempt to standardize diversity data. The manifested at lower taxonomic levels. Assessing changes of ichno- aims of this paper are to document the contrasting ichnodiversity diversity and ichnodisparity as a result of these two evolutionary and ichnodisparity trajectories in soft and hard substrate com- events may shed light on the dynamics of both radiations. The early munities during these two evolutionary events and to discuss the Cambrian (series 1 and 2) displayed a dramatic increase in ichnodi- possible underlying causes of this decoupled evolution. versity and ichnodisparity in softground communities. In contrast to this evolutionary explosion in bioturbation structures, only a few Results Cambrian bioerosion structures are known. -
In Pliocene Deposits, Antarctic Continental Margin (ANDRILL 1B Drill Core) Molly F
University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln ANDRILL Research and Publications Antarctic Drilling Program 2009 Significance of the Trace Fossil Zoophycos in Pliocene Deposits, Antarctic Continental Margin (ANDRILL 1B Drill Core) Molly F. Miller Vanderbilt University, [email protected] Ellen A. Cowan Appalachian State University, [email protected] Simon H. H. Nielsen Florida State University Follow this and additional works at: http://digitalcommons.unl.edu/andrillrespub Part of the Oceanography Commons, and the Paleobiology Commons Miller, Molly F.; Cowan, Ellen A.; and Nielsen, Simon H. H., "Significance of the Trace Fossil Zoophycos in Pliocene Deposits, Antarctic Continental Margin (ANDRILL 1B Drill Core)" (2009). ANDRILL Research and Publications. 61. http://digitalcommons.unl.edu/andrillrespub/61 This Article is brought to you for free and open access by the Antarctic Drilling Program at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in ANDRILL Research and Publications by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Published in Antarctic Science 21(6) (2009), & Antarctic Science Ltd (2009), pp. 609–618; doi: 10.1017/ s0954102009002041 Copyright © 2009 Cambridge University Press Submitted July 25, 2008, accepted February 9, 2009 Significance of the trace fossil Zoophycos in Pliocene deposits, Antarctic continental margin (ANDRILL 1B drill core) Molly F. Miller,1 Ellen A. Cowan,2 and Simon H.H. Nielsen3 1. Department of Earth and Environmental Sciences, Vanderbilt University, Nashville, TN 37235, USA 2. Department of Geology, Appalachian State University, Boone, NC 28608, USA 3. Antarctic Research Facility, Florida State University, Tallahassee FL 32306-4100, USA Corresponding author — Molly F. -
Integrative and Comparative Biology Integrative and Comparative Biology, Volume 58, Number 4, Pp
Integrative and Comparative Biology Integrative and Comparative Biology, volume 58, number 4, pp. 605–622 doi:10.1093/icb/icy088 Society for Integrative and Comparative Biology SYMPOSIUM INTRODUCTION The Temporal and Environmental Context of Early Animal Evolution: Considering All the Ingredients of an “Explosion” Downloaded from https://academic.oup.com/icb/article-abstract/58/4/605/5056706 by Stanford Medical Center user on 15 October 2018 Erik A. Sperling1 and Richard G. Stockey Department of Geological Sciences, Stanford University, 450 Serra Mall, Building 320, Stanford, CA 94305, USA From the symposium “From Small and Squishy to Big and Armored: Genomic, Ecological and Paleontological Insights into the Early Evolution of Animals” presented at the annual meeting of the Society for Integrative and Comparative Biology, January 3–7, 2018 at San Francisco, California. 1E-mail: [email protected] Synopsis Animals originated and evolved during a unique time in Earth history—the Neoproterozoic Era. This paper aims to discuss (1) when landmark events in early animal evolution occurred, and (2) the environmental context of these evolutionary milestones, and how such factors may have affected ecosystems and body plans. With respect to timing, molecular clock studies—utilizing a diversity of methodologies—agree that animal multicellularity had arisen by 800 million years ago (Ma) (Tonian period), the bilaterian body plan by 650 Ma (Cryogenian), and divergences between sister phyla occurred 560–540 Ma (late Ediacaran). Most purported Tonian and Cryogenian animal body fossils are unlikely to be correctly identified, but independent support for the presence of pre-Ediacaran animals is recorded by organic geochemical biomarkers produced by demosponges. -
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Dorjnamjaa et al. Mongolian Geoscientist 49 (2019) 41-49 https://doi.org/10.5564/mgs.v0i49.1226 Mongolian Geoscientist Review paper New scientific direction of the bacterial paleontology in Mongolia: an essence of investigation * Dorj Dorjnamjaa , Gundsambuu Altanshagai, Batkhuyag Enkhbaatar Department of Paleontology, Institute of Paleontology, Mongolian Academy of Sciences, Ulaanbaatar 15160, Mongolia *Corresponding author. Email: [email protected] ARTICLE INFO ABSTRACT Article history: We review the initial development of Bacterial Paleontology in Mongolia and Received 10 September 2019 present some electron microscopic images of fossil bacteria in different stages of Accepted 9 October 2019 preservation in sedimentary rocks. Indeed bacterial paleontology is one the youngest branches of paleontology. It has began in the end of 20th century and has developed rapidly in recent years. The main tasks of bacterial paleontology are detailed investigation of fossil microorganisms, in particular their morphology and sizes, conditions of burial and products of habitation that are reflected in lithological and geochemical features of rocks. Bacterial paleontology deals with fossil materials and is useful in analysis of the genesis of sedimentary rocks, and sedimentary mineral resources including oil and gas. The traditional paleontology is especially significant for evolution theory, biostratigraphy, biogeography and paleoecology; however bacterial paleontology is an essential first of all for sedimentology and for theories sedimentary ore genesis or biometallogeny Keywords: microfossils, phosphorite, sedimentary rocks, lagerstatten, biometallogeny INTRODUCTION all the microorganisms had lived and propagated Bacteria or microbes preserved well as fossils in without breakdowns. Bacterial paleontological various rocks, especially in sedimentary rocks data accompanied by the data on the first origin alike natural substances. -
The Geologic Time Scale Is the Eon
Exploring Geologic Time Poster Illustrated Teacher's Guide #35-1145 Paper #35-1146 Laminated Background Geologic Time Scale Basics The history of the Earth covers a vast expanse of time, so scientists divide it into smaller sections that are associ- ated with particular events that have occurred in the past.The approximate time range of each time span is shown on the poster.The largest time span of the geologic time scale is the eon. It is an indefinitely long period of time that contains at least two eras. Geologic time is divided into two eons.The more ancient eon is called the Precambrian, and the more recent is the Phanerozoic. Each eon is subdivided into smaller spans called eras.The Precambrian eon is divided from most ancient into the Hadean era, Archean era, and Proterozoic era. See Figure 1. Precambrian Eon Proterozoic Era 2500 - 550 million years ago Archaean Era 3800 - 2500 million years ago Hadean Era 4600 - 3800 million years ago Figure 1. Eras of the Precambrian Eon Single-celled and simple multicelled organisms first developed during the Precambrian eon. There are many fos- sils from this time because the sea-dwelling creatures were trapped in sediments and preserved. The Phanerozoic eon is subdivided into three eras – the Paleozoic era, Mesozoic era, and Cenozoic era. An era is often divided into several smaller time spans called periods. For example, the Paleozoic era is divided into the Cambrian, Ordovician, Silurian, Devonian, Carboniferous,and Permian periods. Paleozoic Era Permian Period 300 - 250 million years ago Carboniferous Period 350 - 300 million years ago Devonian Period 400 - 350 million years ago Silurian Period 450 - 400 million years ago Ordovician Period 500 - 450 million years ago Cambrian Period 550 - 500 million years ago Figure 2. -
CURRICULUM VITAE Ilya V. Buynevich Ilya V
CURRICULUM VITAE Ilya V. Buynevich Ilya V. Buynevich Department of Earth and Environmental Science Tel: 215-204-3635 College of Science and Technology Fax: 215-204-3496 Temple University [email protected] 313 Beury Hall http://sites.temple.edu/coastal 1901 N. 13th Street Philadelphia, PA 19122, USA Citizenship: USA EDUCATION 2001-2003 Post-Doctoral, Geology Woods Hole Oceanographic Institution 2001 Ph.D, Geology Boston University 1994 B.A., Geology, Magna Cum Laude Boston University 1989-1991 Dipl. Sci. Program, Marine Geology Odessa National University, Ukraine RESEARCH INTERESTS Coastal and marine geology; field and experimental ichnology; zoogeomorphology; event sedimentology and taphonomy; morphodynamics and stratigraphy of coastal barriers; aeolian processes and dunefield evolution; geoarchaeology and geoforensics; applied high-resolution geophysics (focus: georadar). POSITIONS HELD 2015 > Associate Professor, Earth and Environmental Science, Temple University 2009-2015 Assistant Professor, Earth and Environmental Science, Temple University 2008-2012 Adjunct Graduate Professor of Oceanography, University of Rhode Island 2004-2009 Assistant Scientist, Geology & Geophysics, Woods Hole Oceanographic Institution 2000-2009 Part-time Faculty, Metropolitan College, Boston University 2007-2009 Visiting Faculty, Earth and Environmental Science, Boston College 2007-2008 Adjunct Faculty, Marine Geology, Kiev National University, Ukraine 2003-2004 Research Geologist, U.S. Geological Survey, Woods Hole Field Center 2001-2003 USGS Postdoctoral Scholar, Woods Hole Oceanographic Institution (WHOI) 1999, 2009 Visiting Faculty, Geology, Tufts University 1997-2000 Research Assistant, Department of Earth Sciences, Boston University PROFESSIONAL ACTIVITY 2014 > - Editorial Board, Geology Bulletin, Lviv National University, Ukraine Geology and Geography Bulletin, Odessa National University, Ukraine 2013 > - Editorial Board, Baltica 2011 > - Associate Editor, Journal of Coastal Research I.V. -
The Cambrian Explosion: a Big Bang in the Evolution of Animals
The Cambrian Explosion A Big Bang in the Evolution of Animals Very suddenly, and at about the same horizon the world over, life showed up in the rocks with a bang. For most of Earth’s early history, there simply was no fossil record. Only recently have we come to discover otherwise: Life is virtually as old as the planet itself, and even the most ancient sedimentary rocks have yielded fossilized remains of primitive forms of life. NILES ELDREDGE, LIFE PULSE, EPISODES FROM THE STORY OF THE FOSSIL RECORD The Cambrian Explosion: A Big Bang in the Evolution of Animals Our home planet coalesced into a sphere about four-and-a-half-billion years ago, acquired water and carbon about four billion years ago, and less than a billion years later, according to microscopic fossils, organic cells began to show up in that inert matter. Single-celled life had begun. Single cells dominated life on the planet for billions of years before multicellular animals appeared. Fossils from 635,000 million years ago reveal fats that today are only produced by sponges. These biomarkers may be the earliest evidence of multi-cellular animals. Soon after we can see the shadowy impressions of more complex fans and jellies and things with no names that show that animal life was in an experimental phase (called the Ediacran period). Then suddenly, in the relatively short span of about twenty million years (given the usual pace of geologic time), life exploded in a radiation of abundance and diversity that contained the body plans of almost all the animals we know today. -
Making a Trace Fossil
WSC National Fossil Day 2020@ HOME Making a Trace Fossil Gathering Supplies: Soft Modeling Clay or Homemade Salt Dough Rolling Pen Toothpick Leaves, Sticks, Bark and/or Shells Paint Brushes (Optional) Types of Fossils! There are two main types of fossils that paleontologists study: body fossils and trace fossils. So what is the difference between the two? Body fossils are probably what you think of most when you hear the word fossil. Like the large bones of a dinosaur. Body fossils are fossils that retain or keep the actual remains of an animal, even though it goes through the fossilization process. Think about fossils of a tooth, a claw, or skull of an ancient animal. These are all parts of the actual animal that have become a fossil. So if the original remains of a plant, insect or animal become fossilized, this would be a body fossil. Trace fossils show the activity of a plant or animal, without any of the actual remains being present. Examples of trace fossils are tracks of animals, or signs of their scratching and burrowing. Even fossilized poop is a type of trace fossil. The imprint of a leaf or bark from a tree or the texture of a shell are all examples of trace fossils. Remember a trace fossil will show the presence of an living organism without an actual part of their remains being fossilized. They can give clues to what animals did and how they acted along with what their environment was like. Try This! Making your own trace fossil. Go out on a nature walk with your family, in your neighborhood or in your backyard. -
Gawler Craton: Half a Billion Years Older Than Previously Thought!
ISSUE 92 Dec 2008 Foundations of South Australia discovered Gawler Craton: half a billion years older than previously thought! Geoff Fraser, Chris Foudoulis, Narelle Neumann, Keith Sircombe (Geoscience Australia) Stacey McAvaney, Anthony Reid, Michael Szpunar (Primary Industries and Resources South Australia) Recent geochronology results obtained using Geoscience Australia’s a billion years older than the Sensitive High Resolution Ion Microprobe (SHRIMP) have identified oldest previously-dated rock from Mesoarchean rocks (about 3150 million years old) in the eastern South Australia, making these Gawler Craton, South Australia. These rocks are approximately half the oldest rocks yet discovered in 136° 137° Australia outside the Pilbara and Port Augusta Yilgarn Craton areas of Western 08GA-G01 Australia. A series of seismic transects are being collected across selected regions of the Australian 33° See Inset below Whyalla continent as part of Geoscience Kimba Australia’s Onshore Energy SOUTH Security Program. One of these AUSTRALIA seismic transects, collected in June 2008, traverses the northern Cowell Eyre Peninsula of South Australia Iron Monarch (figure 1). When processed, the seismic data will provide an east– 23 Mile Wallaroo west cross-section of the eastern 34° margin of the Gawler Craton. Spencer Moonta Gulf This region hosts significant CUMMINS uranium, geothermal, copper- Iron Baron/ TUMBY BAY Iron Prince gold, gold and iron resources. Maitland To assist the interpretation of 08-3449-1 0 50 km the seismic data and the current geological mapping program of Mesoarchean granite NT QLD Primary Industries and Resources WA Seismic survey route SA Road South Australia, a program of NSW VIC Railway geochronology is underway to Mineral occurence TAS Town/locality determine the ages of major rock units crossed by the seismic line. -
A Fundamental Precambrian–Phanerozoic Shift in Earth's Glacial
Tectonophysics 375 (2003) 353–385 www.elsevier.com/locate/tecto A fundamental Precambrian–Phanerozoic shift in earth’s glacial style? D.A.D. Evans* Department of Geology and Geophysics, Yale University, P.O. Box 208109, 210 Whitney Avenue, New Haven, CT 06520-8109, USA Received 24 May 2002; received in revised form 25 March 2003; accepted 5 June 2003 Abstract It has recently been found that Neoproterozoic glaciogenic sediments were deposited mainly at low paleolatitudes, in marked qualitative contrast to their Pleistocene counterparts. Several competing models vie for explanation of this unusual paleoclimatic record, most notably the high-obliquity hypothesis and varying degrees of the snowball Earth scenario. The present study quantitatively compiles the global distributions of Miocene–Pleistocene glaciogenic deposits and paleomagnetically derived paleolatitudes for Late Devonian–Permian, Ordovician–Silurian, Neoproterozoic, and Paleoproterozoic glaciogenic rocks. Whereas high depositional latitudes dominate all Phanerozoic ice ages, exclusively low paleolatitudes characterize both of the major Precambrian glacial epochs. Transition between these modes occurred within a 100-My interval, precisely coeval with the Neoproterozoic–Cambrian ‘‘explosion’’ of metazoan diversity. Glaciation is much more common since 750 Ma than in the preceding sedimentary record, an observation that cannot be ascribed merely to preservation. These patterns suggest an overall cooling of Earth’s longterm climate, superimposed by developing regulatory feedbacks -
Innovations in Animal-Substrate Interactions Through Geologic Time
The other biodiversity record: Innovations in animal-substrate interactions through geologic time Luis A. Buatois, Dept. of Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon SK S7N 5E2, Canada, luis. [email protected]; and M. Gabriela Mángano, Dept. of Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon SK S7N 5E2, Canada, [email protected] ABSTRACT 1979; Bambach, 1977; Sepkoski, 1978, 1979, and Droser, 2004; Mángano and Buatois, Tracking biodiversity changes based on 1984, 1997). However, this has been marked 2014; Buatois et al., 2016a), rather than on body fossils through geologic time became by controversies regarding the nature of the whole Phanerozoic. In this study we diversity trajectories and their potential one of the main objectives of paleontology tackle this issue based on a systematic and biases (e.g., Sepkoski et al., 1981; Alroy, in the 1980s. Trace fossils represent an alter- global compilation of trace-fossil data 2010; Crampton et al., 2003; Holland, 2010; native record to evaluate secular changes in in the stratigraphic record. We show that Bush and Bambach, 2015). In these studies, diversity. A quantitative ichnologic analysis, quantitative ichnologic analysis indicates diversity has been invariably assessed based based on a comprehensive and global data that the three main marine evolutionary on body fossils. set, has been undertaken in order to evaluate radiations inferred from body fossils, namely Trace fossils represent an alternative temporal trends in diversity of bioturbation the Cambrian Explosion, Great Ordovician record to assess secular changes in bio- and bioerosion structures. The results of this Biodiversification Event, and Mesozoic diversity. Trace-fossil data were given less study indicate that the three main marine Marine Revolution, are also expressed in the attention and were considered briefly in evolutionary radiations (Cambrian Explo- trace-fossil record. -
Fossil Lagerstätte from Ya Ha Tinda, Alberta, Canada
A new Early Jurassic (ca. 183 Ma) fossil Lagerstätte from Ya Ha Tinda, Alberta, Canada Rowan C. Martindale1,2*, Theodore R. Them II3,4, Benjamin C. Gill3, Selva M. Marroquín1,3, and Andrew H. Knoll2 1Department of Geological Sciences, The University of Texas at Austin, 1 University Station C1100, Austin, Texas 78712, USA 2Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, Massachusetts 02138, USA 3Department of Geosciences, Virginia Polytechnic Institute and State University, 4044 Derring Hall (0420), Blacksburg, Virginia 24061, USA 4Department of Earth, Ocean and Atmospheric Science & National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306, USA ABSTRACT Figure 1. Global paleoge- Lagerstätten—deposits of exceptionally preserved fossils—offer ography during Toarcian vital insights into evolutionary history. To date, only three Konservat- and location of Ya Ha Tinda Hispanic (Alberta, Canada; yellow Lagerstätten are known from Early Jurassic marine rocks (Osteno, Corridor Tethys star), Strawberry Bank (UK; Posidonia Shale, and Strawberry Bank), all located in Europe. We gray star), and Posidonia report a new assemblage of exceptionally preserved fossils from Panthalassa Shale (Germany; black star) Alberta, Canada, the first marine Konservat-Lagerstätte described Lagerstätten. Green areas are Pangea landmasses, light-blue areas from the Jurassic of North America. The Ya Ha Tinda assemblage are shallow seas, and dark includes articulated vertebrates (fish,