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Showing results for tags 'nacre'.
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Hello, I had a question about the coloration of the beautiful South Dakota ammonites from the Fox Hills formation/Pierre Shale. Namely, many Hoploscaphites/Discoscaphites ammonites have a milky white nacre of the shell, whereas others seem to have a vibrant red/brown sheen. For example here are two photos of Hoploscaphites nicoletti I found demonstrating the two types of colorations: I was wondering what causes the difference in this coloration, and whether one is more rare/valuable than the other? I want a nice South Dakota ammonite for my collection and I'm contemplating options. Thanks!
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Hello - I found some fossils on an afternoon walk at my parents' property in upstate New York today. They were in a creek bed. The land is undeveloped (i.e. no paved roads or electricity). They aren't as exciting as lots of stuff on here. I am not necessarily seeking species ID. I am seeking: - clarification on what geological era they were formed in, if possible - whether it is more likely that these fossils originated locally or were transported by glaciers - is that fossilized nacre (cool!!!)? - is it possible that something more interesting is concealed inside the obvious protrusion on one of the rocks? Scale in photos is inches. I have included a picture with the exact location where the fossils were found. I am unsure whether this area of the state was glaciated during the last ice age and so it is unclear to me whether the fossils come from local parent material or whether they originated further to the north. Speculation welcome! Apologies if this is somewhat outside the scope of normal requests. Thanks in advance for any information, and please ask if there is any helpful info I left out! Hoping you are well as you read this post
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From the album: Oxford Clay Fauna
Coprolite Jurassic, Callovian Oxford Clay, Peterborough Member Hampton Lakes, Peterborough, Cambridgeshire, UK A coprolite from an indeterminate marine predator, showing inclusions of nacre, partially digested bone, and fish scales of Pholidophorus? sp. (an indeterminate pholidophorid) and Coccolepis sp. (an enigmantic coccolepid).-
- callovian
- coccolepidae
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Hi! I recently found some large nacreous bivalves, which are embedded in concretion-like cobbles. The matrix is very easy to remove, but the nacre starts flaking as soon as it is exposed to air. Is there a product to stabilize these without future discoloration? Thanks! (Also if anyone can identify, that would be cool--they come from near Scenic, SD)
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Hi All! I found this possible nautilus fossil shell on the beach. It has nacre and also is quite fossilised on the ends. Any help with ID would be very appreciated. Thankyou!
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From the album: North Sulphur River
These wonderful colors you are seeing are from the original iridescent nacre of a baculite from the Late Cretaceous. The colors are caused by "thin film interference," in other words, by the structure of the nacre. -
Deshayesites sp. on a Simbircite stand (from the Ulyanovsk region of Russia)
xraymike79 posted a topic in Member Collections
Deshayesites sp. ammonite with an iridescent nacre of pink, yellow, and green from the original shell. This species is one of my favorite for its preserved iridescence and suture patterns.- 9 replies
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- deshayesites
- nacre
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Hi there fellow, Bought this from that auction web site and was hoping someone could give me an ID. I know it's been polished and all, so I really don't know what is possible to accomplish with these pictures. Any help would be much appreciated.
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- ammonite
- madagascar
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So I finally have an answer to the identity of this fossil I found in a rock quarry in Crescent, Iowa back in 2015... it has been identified as the back half of a eurypterid with the telson attached and nacre. This is a very unusual find for the location and the age of the shale.
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- black shale
- carboniferous
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