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Showing results for tags 'stratigraphy'.
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The latest Chronostratigraphic Chart from the ICS. https://stratigraphy.org/news/143 Numeric Ages altered: 2022/10 - Jurassic: numeric ages of all stages updated to comply to GTS2020 - by request of SCJS (Angela Coe) Tithonian 149.2 +/- 0.7 Ma (was: 152.1 +/- 0.9 Ma ) Kimmeridgian 154.8 +/- 0.8 Ma (was: 157.3 +/- 1.0 Ma ) Oxfordian 161.5 +/- 1.0 Ma (was: 163.5 +/- 1.0 Ma ) Callovian 165.3 +/-1.1 Ma (was: 166.1 +/- 1.2 Ma ) Bathonian 168.2 +/- 1.2 Ma (was: 168.3 +/- 1.3 Ma ) Bajocian 170.9 +/- 0.8 Ma (was: 170.3 +/- 1.4 Ma ) Aalenia
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- chronostratigraphic chart
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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 spec- 6 replies
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Hello all! I managed to secure access to some private land in Gove County somewhere near to Monument rocks. The peoperty has plenty of the chalk canyon type outcrops to explore and I couldn't be happier! I won't make it out there this summer but hope to next summer. I had a few questions that I hoped you all could help with, or point me in the right direction before I head out there. One, I know that the chalk is notoriously difficult to determine stratigraphy in. The chalk I have access to is both higher than and lower than the capstone on Mon
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From the album: Austin Chalk
The Austin chalk as its name suggests is primarily composed of chalk beds with interspersed marls. Here you can see the transition from chalk to marl (light towards the top, grey towards the bottom). I at first hoped this was the Eagle Ford contact horizon (which is a shale with cool shark teeth), but alas not. -
While staying in North Texas I made stops to a couple local creeks such as Fossil Creek in Fort Worth. I've been trying to narrow down the identification of some ammonites and other things but despite the popularity and attention the creek receives I have had a difficult time determining what formations outcrop in the specific area. It's complicated by the fact that I'm not used to the stratigraphic characteristics of the formation of the area. I strongly suspect most of my fossils to have come from the Weno based on stratigraphic descriptions. However, I have read one source that leaves the W
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My folks have a nice lake behind their house. It is relaxing to spend a warm evening watching a heron spear fish or geese fight each other. Or watch silt slowly fill the lake bed. Across the street, a housing developer stripped off a bunch of soil down to the bedrock, but ran out of money before building on the land. This has resulted in some significant erosion and sedimentation in the lake, but this cloud does have a silver lining. I soon noticed a thick bed of shale exposed on the hill. So it was only a matter of time until I make the short trip to the top. The hill,
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Hindia spheroidalis (sponge), Schoharie New York - what age/formation?
Wrangellian posted a topic in Fossil ID
@Scylla was nice enough to send me these two Hindia specimens from the PCS Quarry in Schoharie NY. But we're not clear of the geology. Apparently more than one formation is exposed there. Does anyone know if the formation/age can be narrowed down at all, based on the taxon and location? Also, is the granular texture (esp. the one on the right) indicative of spicules? The one on the left has a depression, as if it were a spherical vase shape with an opening at the top. Is this what Hindia would have looked like in life? The other one has no clear depression, and I wonder why. -
(The "Great Pacific Garbage Patch" is mentioned,BTW) The geological cycle of plastics and their use as a stratigraphic indicator of the Anthropocene Jan Zalasiewicz, Colin N. Waters, Juliana A. Ivar do Sul, Patricia L. Corcoran, Anthony D. Barnosky, Alejandro Cearreta, Matt Edgeworth, Agnieszka Gałuszka, Catherine Jeandel, Reinhold Leinfelder, J.R. McNeill, Will Steffenl Colin Summerhayes, Michael Wagreich, Mark Williams, Alexander P. Wolfe, Yasmin Yonan Anthropocene 13 (2016) 4–17 size,approx. 3,8 mB 817561320_zalasPlasticsAnthropocene.pdf
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The Hell Creek Formation, Montana: A Stratigraphic Review and Revision Based on a Sequence Stratigraphic Approach Denver Fowler Geosciences 2020, 10(11), 435; https://doi.org/10.3390/geosciences10110435 LINK size:approx. 36 mB
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FORMATION BINNING: A NEW METHOD FOR INCREASED TEMPORAL RESOLUTION IN REGIONAL STUDIES, APPLIED TO THE LATE CRETACEOUS DINOSAUR FOSSIL RECORD OF NORTH AMERICA by CHRISTOPHER D. DEAN , A. ALESSANDRO CHIARENZA and SUSANNAH C. R. MAIDMENT [Palaeontology, 2020, pp. 1–21] pala.12492.pdf
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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
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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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- nannofossils
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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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- methodology
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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, Shropshir
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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 see
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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? -
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
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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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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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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 Wahwe- 55 replies
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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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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!!!
