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Showing results for tags 'exogyra'.
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I have an Exogyra costata from the Peedee Form.(Maastrichtian) in North Carolina that has an oddity embedded in the right valve. It is not a shell or barnacle attached to the surface, and is almost perfectly round ,unlike any boring clams I have seen. I have picked ( dental probe) around the oddity to confirm it has depth and is not a surface attachment. It appears it was hollow as it is now filled with hard sediment. It has been suggested this may be an example of bioimmuration of some sort. Anyone have any ideas ? Thanks.
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From the album: Fossil Flourescence
In the daylight, this is an articulated Exogyra shell from the Cretaceous New Egypt Formation as it runs through Mullica Hill, New Jersey. I brought it home because it had an interesting bit of vivianite replacement covering half the surface of one valve. When I brought it home, I noticed some white material inside the cavity of the broken shell. I figured it might be calcite, which sometimes fluoresces. So, I pulled out my UV lamp. To my shock, not only did the white material glow an interesting powder blue color, but the majority of the one valve glows an intense, bright red! Meanwhile, the other valve doesn't glow at all. Scroll right to see what it looked like in the dark with the UV lamp. -
Hi, Recently I found this quite complete (both valves) oyster shell in an Upper Campanian to Lower Maastrichtian strata in SE of Pyrenees. My guess is Amphidonte pyrenaicum, a widespread species in the Tethys at this epoch. Supposing my guess is correct, problem is that I find that species named as (from older to newer papers): Exogyra pyrenaica, Ceratostreon pyrenaicum, Amphidonte pyrenaicum, Amphidonte (Amphidonte) pyrenaicum, and Amphidonte (Amphidonte) pyrenaica. So, I understand that former Exogyra genus has been splitted, Anyone knows of a paper about this issue? Thanks
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Hi my name is Dan and I periodically go down in the central and southern NJ to look for fossils. I have collected at Big Brook and Ramanessin a number of times but am looking to expand my list of sites! Any help would be appreciated! (I found my way here from the FB group)
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I'm studying fossils and I'm having a difficult time understanding the visual(and structural) differences between Exogyra and Gryphaea. Any insights would be very much appreciated!
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Hello, my name is Jake. I am a young major fossil collector and am new to the Fossil Forum. I live in Middletown Delaware and am wondering where I can find the dredge piles at St Georges on the C and D Canal. I have been to the dredge piles at the reedy point bridge before and found a junk load of belemnites. I found it really fun. But me and my mom are major shark tooth enthusiasts and we did not find any. I know that you can find them there but they are not as common at that spot. What I do know is that the dredge piles from the marshalltown formation contain much more shark and vertabre material. So me and my mom want to find those piles. I know that it is in the area around the summit bridge on the north side, but it is a big area and could not find the exact location. I met someone there who had found fossils there before and told me that they are around the soybean field but that area is huge and could not determine the exact location. I was wondering if anyone knows exactly where to find the dredge piles and if you could, please insert a marker of the exact location on a google maps image. Thank You!
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In early July 2016, I encountered a virtual self-guide field trip posted online by Pete R. Rose, PhD in February 2012. He describes an Eagle Ford (Kef) outcrop exposed in the parking lot of Barton Creek Mall in Austin, Texas. I went there to check it out. The USGS webviewer only designates the area as Georgetown-Del Rio. But, the U.T. Bureau of Economic Geology has an accurate Geologic Quadrangle Map #38 that shows this feature. But, it predates Barton Creek Mall which is not on the map. Interestingly, the Austin Chalk Atco Member caps the nearby hilltops, but it is heavily weathered to caliche and rusty ferrous minerals. Difficult to find fossils in the transition zone. The South Bosque member is clearly visible and underlain by the Bouldin Flags (BF) Member. The BF has much thicker flaggy beds than I usually see (up to one foot thick). In the lower part of the BF, I extracted this beautiful slab of what I think are Exogyra columbella levis (Meek). The largest ones are ~1" wide. Most of the Kef outcrops I have visited have just fragmented oyster hash. This is the first time, I have seen the complete fossils rather than just rounded fragments. Also, I think a nearby rock had traces of a fish fin on it. I took a picture just after dark, but left the fossil there. It was a very large rock and a paper-thin fossil remnant. I believe it was about 6 to 8" long. Anyone have better IDs? I was surprised to see Exogyra in the Kef. Lee Schnelle
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From the album: North Sulphur River Texas
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I recently found this cluster of Exogyra at the North Sulphur River Texas. I would like to clean it up some so I could see them all and display it. What's the best way for a beginner to prep a piece like this? Sorry for the poor quality photo.
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7 Mosasaur vertabrea, Enchodus tooth, Exogra in matrix and possible coral. Waded water and climbed through mud and to get to areas without footprints.
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These are two of three "fossils" I found on my trip to Big Brook in New Jersey last week, the stream runs through sediments that date back to the late Cretaceous.(the third one I will post later today hopefully). After having been really excited about this find, and then having done a decent amount of research I think I am safe in assuming that this is just concretion, or a psuedofossil if I am using those terms correctly. Even though this is the conclusion I have come to, this is my first fossil hunting trip and I would love some second opinions to either confirm my theories or offer some new insight. This one is about three inches long, and two inches thick. These two images are what I believe to be extinct clams, Exogyra. It doesn't seem like it is the shells, but just a fossil of the clam itself (if that makes sense). Again, I would love to hear what anyone in the community has to say.
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This is the most intact specimen i've ever held. From a Coon Creek formation. About 72 mya. It does have a small chip along its outter edge missing...this happened in the collecting process in the field, also a spot of minor water-wear. I woild call this a 10, if not for the small damage, it would be a 10+ in my mind. A google search doesn't really show much that is on this specimens level. I have speculated that the reason this Exogyra is so complete is because it doesn't show good signs of an attachment scar. (From whatever it had originally stuck itself too.) This is just me guessing, but i like to envision this creature was stuck to something that over time just wasn't able to hold this shell to it, from there it fell to a place on the bottom in which sediments accumulated @ a faster rate. This lil guyfought as long as he could, but one day, the sediments that had been deposited on his upper surface became too great to bear....and that was the last day this shell ever opened! Always been curious "what's in there" . Have read that Exogyra's die in an opened position. You can see this specimen is still locked in @ the hinge. It appears to me it died in a closed position? @ any rate, this is the most complete example i've ever seen.
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I found these and many more in creek areas in two sites here in San Antonio. I love that my greatest finds have been here in my hometown of San Antonio. While Austin is my main source for a grand looking Exogyra Ponderosa, would you believe that its equal in size and shape is down here in San Antonio. I don't know which variety but the striations are very different and the horn curl is equally different at times. I will post some more soon and of Austin. Thank you for looking.
