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Showing results for tags 'stratigraphy'.
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Hi all y'all. I'm curious about learning more about our local geography to learn more about the context for fossils I find around here. I know a little bit, but not a ton and I'd love to learn more. I think I should probably start with what's exposed at the surface at my house. We're in the Balcones Fault Zone, and I've seen this spot mapped as both undifferentiated Fredricksburg Group and as Edwards Group. We've got a little intermittent creek with a deep enough valley/canyon that there's probably a 50' elevation difference between the highest and lowest areas. Being in West Austin, we do have exposed limestone cropping out at the surface. There aren't really any big cliffs, but the terrain sort of stairsteps down from the top to the bottom, with small cliffs a few feet tall interrupting the slope down. I haven't looked at all the layers closely, but it seems like there are a few layers of more porous limestone completely chock-full of shells. Would those be reef layers? This rock is a good example from one of those layers, but it seems to have more shells and bigger pieces than most of the similar layers (though it may just be less weathered...) The hard limestone exposed in the bed of the creek has what appear to be burrows, I think? The same rock layer has a few of what I believe are rudist fossils. I'm still not 100% on what rudists look like, but is this one? Higher up, there's some extensive chert/flint layers, but also some other more fossil-y layers. I'm thinking it might be a good idea to try making a stratigraphic column so I can better figure out exactly what I'm looking at, but I'm not really sure how to do that. I've got no experience in geology and would love to learn. Do any of y'all have good advice for how to go about doing this? I'm still not 100% on how to classify different carbonate rocks, so any resources you can point to for that would be greatly appreciated! I know a wee bit about our local geology, but I'd also appreciate any more in-depth resources y'all can recommend! Thanks a lot!
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PDF BIOSTRATIGRAPHIE DU JURASSIQUE OUEST-EUROPÉEN ET MÉDITERRANÉEN Zonations parallèles et distribution des invertébrés et microfossiles Elie CARIOU & Pierre HANTZPERGUE memoire 17 Elf exploration & Production @Coco @michele 1937 @fifbrindacier typologie:ouvrage synthetique,et:utile,probablement edit: pour probablement,lire: peut etre Useful stratigraphic information in this one edit 2: ca. 31 MB,alors:large
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- porifera
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a slight caveat: the piece is from 2005 supplementary(and included): reasonably large character/taxon matrix Paleobiology, 31(3), 2005, pp. 400–423 Integrating ichnofossil and body fossil records to estimate locomotor posture and spatiotemporal distribution of early sauropod dinosaurs: a stratocladistic approach Jeffrey A. Wilson wilsondinosaurop{ichnolstratocladisphenet+.pdf
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NOhlMunneck Reconstructing time and diagenesis of limestone-marl alternations from the selective compaction of colonies of the tabulate coral Halysites Theresa Nohl & Axel Munnecke Bulletin of Geosciences 94(3), 279–298 size:about 21 MB recommended
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Hello, I am searching for geologic time dates for some formations. Most are named in the 1800's, so the names may make no sense. Europe Maybe France? carboniferous limestone of borlton, County of La Couronne Ireland, Lower Carboniferous Limestone, Ireland Calc carbonif Armagh? Formation and locality: Mountain Limestone, Armagh England, Ticknall Formation, Mississippian, Ticknall, South Derbyshire, England carboniferous limestone around Bristol Carboniferous Limestone: Oreton, Shropshire. United States Kansas, USA Plattsmouth limestone, Oread formation, Virgilian, upper Pennsylvanian, in a quarry in northwestern Franklin County, Kansas Indiana, USA Keokuk beds, Bono, Lawrence county, Ind. Clark and Harrison. counties Illinois, USA Subcarboniferous (Keokuk); Illinois, Iowa Chester limestone, Chester and Pope county, Illinois. Worthen used the name Chester limestone for the same beds which Hall called Kaskaskia, but included this Chester limestone with the underlying sandstone in what he called the "Chester Group." In the limestone above coal No. 8, Upper Coal Measures; near Springfield, Illinois. In the upper beds of the St. Louis limestone; Alton, Illinois. Pennsylvania, USA a stratum about one foot thick, black, carboniferous, and calcareous, head of inclined plane number 3 of the old portage railroad," which crossed the Alleghany Mountains from Hollidaysburg Ohio, USA coal measures of Cambridge, Ohio. Limestone near Cambridge Nebraska, USA Upper Coal Measures, Bennet's mill, near Nebraska City.
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- united states
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The 2020 Geologic Timescale from stratigraphy.org is out: http://stratigraphy.org/index.php/ics-chart-timescale
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I've just purchased a fine slab of belemnites from Holzmaden and the stratigraphy is given as Posidonienschifer, Lias epsilon II-102. I know that epsilon is Lower Toarcian but please could anyone enlighten me about the II-102? I particularly want to correlate this accurately with Yorkshire, if possible! @belemniten ? EDIT: I've just checked the seller's other material and one that I'd expect to be from the same beds is given as "II-12" - so @oilshale is almost certainly right with his answer below, and it seems to be near the base of the Bifrons Zone.
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45437447.pdf Netherlands Journal of Geosciences — Geologie en Mijnbouw | 84 – 3 | 283 - 301 | 2005 Stratigraphic ranges of mosasaurs in Belgium and the Netherlands (Late Cretaceous) and cephalopod-based correlations with North America J.W.M. Jagt
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Since I asked it, this isn't a dumb question (is older up or down?)
SteveE posted a topic in Questions & Answers
As they said in school the only dumb question is the unasked one. So here goes... Instead of wasting field time fumbling around trying to figure this out, could someone please tell me how to read these sorts of section descriptions? Is the top of the printed list the top of the rock layer or the bottom? -
What Fossils Alone Can’t Explain About Dinosaurs When time is measured in 10-million-year blocks, the lines between ecosystems and animals that would never have coexisted can get blurry. Laura Poppick, The Atlantic, August 17, 2019 https://www.theatlantic.com/science/archive/2019/08/paleontology-precision-problem/596176/ Yours, Paul H.
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- dinosaurs
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I made my first trip to the massive Ordovician roadcut near St. Leon IN yesterday. Had a good time. One question I had was about the different formations present there. If I understand correctly, most of the Richmond Group is exposed there, and bottom to top is the Waynesville, Liberty, and Whitewater formations. I really couldn't make out any clear divisions in the exposed rock though. From what I've read, the butter shale trilobite layer is the Liberty formation. I spent most of my time collecting on the second terrace, which appeared to be made at the top of the butter shale layer. So that would be the Liberty formation? I also collected some hash plates on the way down, which I suppose could have been either Liberty of Waynesville, but also could have been scree from any place in the roadcut. Should I label my finds as just coming from the Richmond Group and not worry about which specific formation?
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link Martino, R. L., 2004, Sequence stratigraphy of the Glenshaw Formation(middle– late Pennsylvanian) in the central Appalachian basin, in :J. C. Pashin and R. A. Gastaldo, eds., Sequence stratigraphy,paleoclimate, and tectonics of coal-bearing strata: AAPG Studies in Geology 51, p. 1–28. size: about 6 Mb the emphasis is on sequence stratigraphy and (correlation of)paleosols: the need for a background of knowledge of these subjects lies in the gray area between "absolutely necessary" and "comes in handy"
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- paleosols
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THE CHRONOPHYLETIC APPROACH:STRATOPHENETICS FACING AN INCOMPLETE FOSSIL RECORD by JERZY DZIK [Special Papers in Palaeontology, 73, 2005, pp. 159–183]
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Red Dirt, Blue Scorpions, Yellow Rock, and other Colorful Oddities
DeepTimeIsotopes posted a topic in Fossil Hunting Trips
Another snow storm has swept through here so how about we take a trip to Southern Utah in mid-June. I will be straightforward with you, I didn’t get many fossils from this trip but if you would like to hear my tale of woe read on! Let’s start out with the stratigraphy column. You’ll notice most of it is red. If you’ve read some of my other trip reports you’ll probably know what that means, no fossils to report from this area. My structural geologist buddies had a blast, though, so beware a lot structural and sedimentary geology ahead. I’ll save talking about the Wahweap Formation for the end.- 55 replies
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- southern utah
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WARD Lauck W.Ward Stratigraphy and Characteristic Mollusca of the Pamunkey Group(Lower Tertiary) and the Old Church Formation of the Chesapeake Group,Virginia Coastal Plain United States Geological Survey Professional paper 1346 About 25 MB As such things go:detailed!!!
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- basin analysis
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Fairly recent bit of opal fossil research
The Amateur Paleontologist posted a topic in General Fossil Discussion
After learning about Weewarrasaurus, I thought it'd be nice to report the 'lesser-known' recent bit of research about the opalised fossil site Lightning Ridge (New South Wales, Australia) It's basically the most up-to-date paper dealing with the geology - including age, stratigraphy and lithology - and vertebrate paleontology. The paper provides many new details about the Griman Creek Formation (GCF), a Cenomanian (mid-Cretaceous) formation which crops out in the area around Lightning Ridge. The GCF is a formation especially known for its diverse vertebrate paleo-ecosystem; of which many species are represented by quite a few opalised fossils The paper is also rather neat as it contains a nice overview of all the vertebrate groups represented at the GCF - an overview complete with a comprehensive (and up-to-date) list of vertebrate taxa, and several nice pictures of opalised vertebrate fossils Finally, the paper also indicates that a new ornithopod genus (Fostoria) from the GCF is soon going to be published Bell, P. R., Fanti, F., Hart, L. J., Milan, L. A., Craven, S. J., Brougham, T., & Smith, E. (2018). Revised geology, age, and vertebrate diversity of the dinosaur-bearing Griman Creek Formation (Cenomanian), Lightning Ridge, New South Wales, Australia. Palaeogeography, Palaeoclimatology, Palaeoecology. Abstract: The mid-Cretaceous Griman Creek Formation (GCF), which crops out near the town of Lightning Ridge in the Surat Basin of north-central New South Wales, Australia, is noteworthy for its opalised vertebrate fauna. The fossil assemblage comprises remains of aspidorhynchid teleosts, lamniform chondrichthyans, dipnoans, chelid and possible meiolaniform turtles, leptocleidid-like and possible elasmosaurid plesiosaurians, anhanguerian pterosaurs, titanosauriform sauropods, megaraptoran theropods, ankylosaurians, several forms of non-iguano- dontian and iguanodontian ornithopods, crocodylomorphs, enantiornithine birds, and stem and true mono- tremes, making it one of the most diverse mid-Cretaceous terrestrial vertebrate faunas in Australia. A detailed stratigraphic survey of twenty subterranean opal mines provides new information on the geology, age and pa- laeoenvironment of the main fossil-bearing beds. Vertebrate remains derive from the ‘Finch Clay facies’, lat- erally-extensive but discontinuous lenses of claystone that likely accumulated relatively rapidly in near-coastal but freshwater embayments (i.e. lagoonal conditions), and probably represent a single, roughly con- temporaneous fauna. U-Pb age dating of detrital zircons extracted from a distinct layer of volcanogenic claystone immediately overlying one of the opalised fossil-bearing layers yields a maximum depositional age of 100.2–96.6 Ma. These new dates confirm an early to mid-Cenomanian age for the fauna, rather than Albian, as has been reported previously. The GCF at Lightning Ridge is therefore equivalent to the middle part of the Winton Formation (Queensland) and several million years older than the sauropod-dominated fauna at Winton. For those who want the paper, PM me your email address and I'll send it to you -Christian- 3 replies
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here Nat. Hazards Earth Syst. Sci., 15, 1181–1199, 2015 www.nat-hazards-earth-syst-sci.net/15/1181/2015/ doi:10.5194/nhess-15-1181-2015 © Author(s) 2015. CC Attribution 3.0 License. Internal structure of event layers preserved on the Andaman Sea continental shelf, Thailand: tsunami vs. storm and flash-flood deposits D. Sakuna-Schwartz1,* , P. Feldens1 , K. Schwarzer1 , S. Khokiattiwong2 , and K. Stattegger edit< about 4.8MB
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Cretaceous Stratigraphy and Paleontology of West-Central Alabama - Guidebook
Oxytropidoceras posted a topic in Fossil News
David C. Kopaska-Merkel and others, 2016, Cretaceous Stratigraphy and Paleontology of West-Central Alabama: A guidebook. Black Belt Museum. https://www.researchgate.net/publication/312232486_CRETACEOUS_STRATIGRAPHY_AND_PALEONTOLOGY_OF_WEST-CENTRAL_ALABAMA_A_GUIDEBOOK Yours, Paul H.-
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Any ichnofossil specialist in there? Ichnofossil from Brazil Jurassic ID
Aerson posted a topic in Fossil ID
Hello everyone. I'm a geologist/stratigraphist and I've been studying Missão Velha Formation (Araripe Basin, Brazil Jurassic-Cretaceous) for a couple of years. We found some structures that seem to be trace fossils, but as geologists, we assume ourselves to be slightly ignorant in ecologic behavior of species. The MV Formation are corsed sandstones, well stratified, with few purple siltic-sandstone levels with ped structures. These trace fossils I'll be presenting next resemble the top of one of these siltic-sandstone levels. They are tridimensional and cilindric, with an spheric edge on the bottom and the top is not well seen. It have sort of a stratification, like it was many piled up rings. -
a recognized classic Indispensable! Worsley,Aarhus et al:The Silurian Succession of the Oslo Region NGU Bull.384,1983 ABOuT 7,5 MB NB: NO fossils are figured,the emphasis is on local correlation and stratigraphy
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link This being: Stratigraphy and Fossil Plants from the Cutler Formation (Late Paleozoic) and their Paleoclimatic Implications, Eastern Paradox Basin, Colorado Kendall R. Grazul , Jacqueline E. Huntoon , and Jennifer M.K. O’Keefe from: GEOLOGY OF THE INTERMOUNTAIN WEST NO taxonomy,short review of the paleo-enviroment and the stratigraphy,several taxa illustrated NB: there is a "screen-optimized version",and this is NOT it 6,81 Mb
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From the album Calvert Cliffs
This view of the cliffs in Calvert County, Maryland is gorgeous. I don't often see quite the vivid color range in this formation. I didn't linger, though, and I was wading in the bay to keep my distance. See those trees at the top of the 40 ft +/- cliff? The ones with the roots hanging over the edge? Those aren't going to be at the top of the cliff for long. At this point, they are probably only still there out of sheer habit. We did her a landslide the night we arrived, the spoils of which are in some of the following images in this album. I was on a trip earlier in the year, at a different part of the cliffs, when someone did get hit in the head by a bit of falling clay. Lucky for her, it wasn't a big chunk or from very high up. She *only* had a concussion. If ever you are close to the cliffs like this, watch and listen to where you are at all times. Run like crazy if you hear anything falling! DO NOT TOUCH THE CLIFFS! DO NOT STAND ON THE TOP EDGE OF THE CLIFFS! That prize Meg tooth isn't worth your life. -
The latest version of the International Chronostratigraphic Chart/Geologic Time Scale is now available! (v 2018/07), which contains significant updates to the Quaternary and Cambrian System, is now formally released. Download available in link New Holocene subdivisions: Greenlandian (11,700 yr b2k) Northgrippian (8326 yr b2k) Meghalayan (4200 yr before 1950) http://www.stratigraphy.org/index.php/ics-news-and-meetings/120-ics-chart-containing-the-quaternary-gssps-and-new-stages-v-2018-07-is-now-released
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here(lessthan 5 Mb) The Cedar Valley/Lime Creek piece by some noted experts would seem to steal the show. Fig 3, with its correlation chart. (useful inclusion of a Vail Transgressive/Regressive cycle chart!!!!) Figure gets better and more useful each time I look at it.
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QUAT glacai The Scheldt estuary trawl crowd might find this useful,perhaps About 5-10 mB each,source: JGSL,jan 2018 issue
