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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
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A lovely 18" belemnite slab I've bought for my birthday (birthday belemnites are a bit of a tradition!). From the Jurassic Posidonienschiefer (Toarcian, Upper Lias) of Holzmaden - a very interesting and unusual selection of mostly the same species, one with a nice epirostrum. Not quite sure of the actual species, but it's close to Acrocoelites subtenuis and A. gracilis - neither of which usually have epirostra (the squashed bit at the tip of photo 2). It also contains a couple of bonus teeth including a Hybodus type which Sebastian @belemniten tells me is a rarity there. Apart from the fact it's a great display piece, the main reason I bought it is its faunal similarity to the basal beds of the Alum Shales around Whitby in Yorkshire, known as the "Hard Shales" (Toarcian, Bifrons Zone). There, you get accumulations of Acrocoelites subtenuis at the same sort of density - possibly conspecific with these, but never showing an epirostrum. One possible reason for this is that the epirostrum is a sexual dimorphism, connected with breeding grounds, so they only occur in specific areas at any given time. Or it may just be a different species... form with short epirostrum: orthorostrum:
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From the album: Holzmaden
This is a beautiful 15 cm long Acrocoelites (belemnite) from the lower Jurassic from the quarry Kromer near Holzmaden. Its special because of its great preservation and because it has an enlarged furrow, which was probably caused by an infection or a bite. One of my best belemnites until now! Two more pictures: The enlarged furrow: -
Here are two of my best belemnites I found this year in the quarry Kromer near Holzmaden (Lower Jurassic, Posidonia Shale) . I found tons of them this year but mostly they aren't that good preserved. The first one is about 15 cm long and is a relatively new find. I finished the prep yesterday. It's really good preserved and not too short. It should be Acrocoelites because I think I can see three apical furrows. Noticeable is that one of the apical furrows is really big. Maybe @TqB can tell a little bit more about this belmnite? And the second one is a 14 cm long belmnite with a crushed epirostrum. It could be Cuspiteuthis tubularis or a Acrocoelites inaequistriatus (thanks again for the ID Tarquin). Sorry the pictures are not the best but I thought some of you are more interested in seeing some invertebrate stuff from that quarry (normally I show the vertebrate material). Thanks for viewing
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Recently I wasnt very active here but I managed to find a couple fossils in the meanwhile. A week ago I planned to visit the Pliensbach near Holzmaden in Germany. The Pliensbach is a type locality for the so called Pliensbachium, a time period in the lower Jurassic. On the way I saw an old pile with some jurassic rocks and stopped there. Luckily I was able to find some fossils there! Here is a picture of the view I had on the top of the pile: Belemnites are very common there but I found two really nice and big ones. Both are about 15 cm long and they seem to be Acrocoelites(?) ( @TqB ). They are one of my best belemnites until! I also found remains of a very rare layer with many sea urchins and sea urchin spines in it. Too bad I wasnt able to find some urchins but I found some cool plates with many spines. At the top of the pile I found some ammonites from the Sinemurian. I like the pyrite on them! The one I am holding is probably an Oxynoticeras and the other one is a Gagaticeras: Here is an overview: And one more detailed picture: Finally I found a piece of Loligosepia aalensis (vampyromorpha) and some fish rests. Here is a picture of the vampyromorpha: Alter my visit at the pile I was at the Pliensbach for a short time but I didn't really found something I can show. Maybe I will post one or two pictures tomorrow. Thanks for watching
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From the album: Holzmaden
This one is a 14 cm long Acrocoelites from the quarry Kromer near Holzmaden (Lower Jurassic, Posidonia Shale). Some more pictures: This is one of my favourite Belemnite from there.-
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From the album: Holzmaden
Another belemnite (perhaps Acrocoelites) with a length of 10 cm from the quarry Kromer near Holzmaden (Lower Jurassic, Posidonia Shale). -
From the album: Holzmaden
Another 12 cm long Acrocoelites from the quarry Kromer near Holzmaden (Lower Jurassic, Posidonia Shale). -
From the album: Holzmaden
A nice combination of two Acrocoelites gracilis from the quarry Kromer near Holzmaden (Lower Jurassic, Posidonia Shale). The bigger one is 17 cm long and the other one is 14 cm long. -
From the album: Holzmaden
A colorful 9 cm long Acrocoelites from the quarry Kromer near Holzmaden (Lower Jurassic, Posidonia Shale). -
From the album: Holzmaden
A 10 cm long Acrocoelites from the quarry Kromer near Holzmaden (Lower Jurassic, Posidonia Shale).- 3 comments
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From the album: Holzmaden
A 9 cm long Acrocoelites from the quarry Kromer near Holzmaden (Posidonia Shale). -
At over 4" across, this is the last few chambers of by far the largest diameter belemnite phragmocone I've ever seen. (If anyone has one from a Megateuthis, I'd love to see it! - they don't seem ever to be preserved.) Given to me by a friend, it is in a nodule from the Jet Rock (Upper Lias, Lower Jurassic) of Port Mulgrave, north Yorkshire coast. It must have belonged to an exceptionally large Acrocoelites trisulculosus which is probably the only belemnite to occur in this bed. It's a large species anyway - typical rostra of it are 5 - 7" long but about 9" has very rarely been recorded so a bit longer may be possible. Photo 6: Not having such a large Acrocoelites in my collection, I've done a conservative mock-up of it with a smallish (9") Megateuthis and another piece of phragmocone which is my second largest... A total length of 20 - 24" seems about right. Photo 7: For comparison , I have a complete but crushed example of A. trisulculosus about 12" long, the rostrum being 6.5". 1) 2) 3) 4) 5) 6) This should probably be stretched more... 7) A normal size Acrocoelites trisulculosus with crushed phragmocone (the strange ridged structure on top of it is a crushed on-edge Harpoceras shell mouth)
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The phragmocone is partly in a nodule, the rostrum protruding from it - quite rare in these beds. It has the remains of an epirostrum. Assigned to Megateuthis in: Doyle, P. 1990-92 The British Toacian (Lower Jurassic) Belemnites. Monograph of the Palaeontographical Society, London: Part 2, 50-79, pls.18-28 (Publ. No. 587, vol. 145 Contentious taxonomy down the years - diagnostic features include the pair of dorsolateral apical grooves. Similar specimens of Acrocoelites sp. are supposed to have an additional ventral groove but this is variable ...
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From the album: Holzmaden
Two belemnites (i think) both Acroceolites from the quarry Kromer in Holzmaden. The whole one is 13 cm long and the damaged one 11 cm. -
From the album: Holzmaden
A Acrocoelites (13.5 cm long) from the quarry Kromer in Holzmaden. -
From the album: Holzmaden
Fossil: Acrocoelites Location: Quarry Kromer in Holzmaden Age: lower Jurassic Size: 11,2 cm long -
From the album: Holzmaden
A Acrocoelites (16 cm long) from the quarry Kromer in Holzmaden. -
From the album: Holzmaden
A 8 cm long (short) Acrocoelites from the lower Jurassic in Holzmaden. -
From the album: Holzmaden
Acrocoelites (?) from the lower Jurassic in Holzmaden. Size: 11 cm long -
From the album: Holzmaden
Two bad preserved belemnits (Acrocoelites). Both are about 8-9 cm long. Found in Dormettingen, Age: Lower Jurassic. -
From the album: Holzmaden
Acrocoelites, Holzmaden/ Germany, ca 7cm long -
From the album: Holzmaden
A nice Acrocoelites from the quarry Kromer in Holzmaden. Its about 9 cm big. -
From the album: Holzmaden
A nice Acrocoelites from Holzmaden (quarry Kromer) / Germany. -
From the album: Holzmaden
Acrocoelites Dormettingen / Germany
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