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Showing results for tags 'carbonate'.
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Hello, I'm struggling to identify what this trace fossil is and what its ichnofacies is! Please help and let me know what info you need!
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- carbonate
- hardgrounds
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Hi! Is this a stromatolite? I picked up this rock on the premises of the Teleajen oil refinery in Prahova county, Romania. I have seen a chert wedge in a limestone boulder once upon a time, but this stone is different. It has layers of chert and carbonate, right? I grinded and polished the stone. Here is a close-up from the carbonatic area (fizzles with acid): Any idea how old are these rocks when found in S-E Europe? Thanks!
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I've never put much time into sectioned and polished fossils, usually just because I don't usually collect material that would look well cut over whole. While preparing a trilobite I collected in Illinois over the Summer and I was cutting sections off the matrix bottom so the matrix lay flat as a stand. To my surprise I ended up cutting thin sections through a Favosites coral that piqued my interest. Coincidentally, this was at the same time @FranzBernhard posted his thread demonstrating a low-cost approach to polishing and sectioning small carbonate rocks and fossils by hand. With such a handy guide put forward at a perfect time I decided to try my hand at sectioning and polishing fossils. I was waiting on grit polish in the mail for a while and that has now arrived which allowed me to finally try some sections myself. I figured I'd post the humble results here so as to encourage more people who might be interested in trying this. I've cut lots of rocks before but this was my first time attempting polishes. The uneven cuts from some of the specimens are noticeable in the polish. I tried to grind some of the surfaces even before polishing but this was more difficult for the hard material. Oh well. I think I can improve the fine polish on a lot of these by putting more time into them but I think this was good as a first attempt.
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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!