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Showing results for tags 'muscle'.
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I've been looking at my specimens of Acrocoelites trisulculosus from the Toarcian Jet Rock (Mulgrave Shale Member = Falciferum Zone) of the north Yorkshire coast. This is an anoxic mudstone deposited during a prominent worldwide Ocean Anoxic Event (OAE) and, as might be expected, the preservation is very good. A number of them (7 so far) have a thin pyrite layer around the apex. This shows obvious lineation in all of them, mostly oblique to the axis of the rostrum. As pyrite is often associated with soft tissue decay, I strongly suspect that this is preserving muscle texture. The texture is similar to that preserved in some other coleoids (e.g. from Solnhofen). Has anyone else seen this? Comments welcome! EDIT: I may be wrong about the soft preservation - a few well preserved specimens from other localities (though not from here) show similar texture on the calcite. Most belemnites look smooth though. (Comments and photos further down this thread) Just two of the specimens here: No. 1: No. 2: left lateral (with divided dorso-lateral furrow - a little unusual) right lateral
Hi I’m wondering what the Antorbital fossa is for in dinosaurs. I heard it could be part of muscle attachments or nasal passages. If so if a dinosaur has a big Antorbital fossa does it mean they have better nose or stronger jaw muscles. Thank you!!
Stopped on the side of the road near the Petrified Forest in Arizona, to see what I could find and can't get over how much this piece seems to resemble muscle tissue, but thought that's gotta be unlikely. I did some quick research and found out there is such a thing, but it seems uncommon. Hoping people here with better eyes might be able to tell me what I am looking at. Help!