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Showing results for tags 'carbonate'.
Found 8 results
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Fuchs_et_al_2015_PZ.pdf @TqB @belemniten @PFOOLEY @DPS Ammonite and perhaps a host of others? The list of authors read like a who's who of "paleomalacology" /RECOMMENDED!!!!!! ___________________________________________________________________________ A nearly complete respiratory, circulatory, and excretory system preserved in small Late Cretaceous octopods (Cephalopoda) from Lebanon Dirk Fuchs • Philipp R. Wilby • Sigurd von Boletzky • Pierre Abi-Saad • Helmut Keupp • Yasuhiro Iba Palaontol Z. DOI 10.1007/s12542-015-0256-6 ____________________________________________________________________________________________________
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- plattenkalkk
- cretaceous
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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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- iowa
- stratigraphy
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Hi everyone, i found this in a little crop of well-stratified limestone/dolomite in the middle of the carbonate platform. What is it?
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The tags about cover it. García-Garcíaplapueyquaterntufatravert2013.pdf
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And some geochemistry as well.. A reasonably instructive figure 10(carbonate dilution,cyclicity) reboupittetpalcu3de.pdf
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Hi all, I found these recently along Colorado's front range in the Niobrara Fm, about 20 mins southwest of downtown Denver. I am familiar with inoceramus, but these pieces have ridges - something I didn't think inoceramus had. They also have a similar cross-sectional structure with aragonite as the inoceramus fossils I've found, which makes me think it's some other type of clam or bivalve, maybe platyceramus? The largest piece appears to have small attached bivalves. Thanks for your help!
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I suppose these are boring to most people but they have piqued my interest as of late, when I started noticing how many of them there are and how consistent their form. It appears as a trough-shaped thing made of carbonate, lighter than the surrounding black shales. These shales (Haslam Fm, Upper Cret.) are full of odd blobs and lumps and tube-shaped things that I have always ignored, assuming they were non-fossil, but they don't seem to work as burrows or concretions either, and considering the possibility of calcareous algae and the like, I started to wonder. (Do burrows ever have a U-shaped cross-section, and why would they have a lighter, calcareous appearance?) This one is not the best example, I need to pick up more when I see them, but hopefully you can see what I'm looking at. There are some lumpy, grainy shapes as well: Possibly a (sideways) U-shaped cross-section on the end here too but it is faint. Lots of variety of shapes aside from the usual roundish concretions, many nondescript but some recurring patterns among them such as the above. They all have a calcareous/carbonate composition (I assume from the lighter color). Any opinions? Biogenic or not? What would account for the formation of this long trough shape in particular? I will make a point of picking up more/better samples and add them here.
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Recrystallized Fossil From The Permian Park City Fm. (Phosphoria), Central Wy
dazzle posted a topic in Fossil ID
Hi folks, I found these specimens in a Permian dolomud/wackestone in central WY (Fremont County). It is from the Park City Fm. (Phosphoria equivalent). I've attached photos of two different specimens which were found about 10-15 meters from each other in the same bed. I found a few other examples, and they were typically spaced about that distance apart from one another (in other words, they don't seem to form colonies), and they were by no means common. These appear to be recrystallized (see macro images). As I said, I think this is a dolowackestone "matrix" and there appear to be some silicified (chert) burrows nearby to the specimens, for what that's worth. Up is stratigraphic up in the photos (photos are perpendicular to bedding, i.e. cross-section view). I can't find anything like this described in the literature on the Park City/Phosphoria, and I was hoping that someone with a little more experience in Permian fauna (e.g. the Capitan reef builders) or other might have some insight. I was able to collect one specimen, which I plan on cutting and polishing, and also making a thin section for a closer look. In the meantime, any thoughts on what I might be looking at?? Thanks very much in advance!
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