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From the album: Late Jurassic Ammonites from Southern Germany
2 Garnierisphinctes sp. ammonites along with a number of small sponges and some shell bits. 12x8x4cm. From the divisum zone, Kimmeridgian, Lacunosamergel Formation in the upper Danube valley. -
Calcite mold. Complete specimen. Only the apophyse is missing on this microconch. C. divisum is generally larger than C. crusoliense, which reaches an adult diameter of at the most 15 cm. The bipartite ribs crossing the venter continue mostly on until the end of the bodychamber and can become irregular, whereas by C. crusoliense they tend to merge towards the end and remain relatively constant.
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Since the new collecting season is opening now that most of the snow has left the more populated areas in the northern hemisphere, I figured I could turn over a new leaf instead of posting in the old thread. For those of you who might not be familiar with it, it's a site in the upper Danube Valley that I've been excavating on and off for a good 2 years now and there's still no sign that it'll be drying up soon. It's in the Late Jurassic Kimmeridgian and most of the finds are out of what we call here the divisum zone, named after the ammonite Crussoliceras divisum, which occurs in it. As the title infers, the site is in a ditch at the side of a road cut. I manage to get out there at least once a month, when not more often and I was just there again this week. Here are some old photos of the site and some of the recent finds. Here is a Garnierisphinctes sp., which, although it has a diameter of 13cm., is still just the phragmocone. And here is a Discosphinctoides sp., also a phragmocone measuring 9cm. Here are 2 smaller ones which I have yet to identify. The second one has an Atreta sp. bivalve attached to it.
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Steinkern.
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Most of the snow has melted away in the lowlands, at least for the time being, so I took the opportunity a few days ago to drop into the ditch in the Kimmeridgian in the Danube Valley for a couple of hours. It was drizzly weather, but that didn't bother me, being happy to just get out and dig a bit. Found a few nice ammonites which I've still got to prep, but I spent an hour or so abrading this sponge today. Like I've said before, I usually leave most of the sponges where they are, but this one was complete and also quite large at 20cm. length. If I abraded the entire insides, I could fill it with tobacco and have a smoke I'm not sure, but I think it could be a Cylindrophyma sp.
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This was in 2 pieces which were repaired. Mostly phragmocone.
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Limestone mold of the phragmocone.
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Calcite mold with a fine residue of green glauconite on the phragmocone. This is the index fossil for the divisum zone. C. divisum is generally larger than C. crusoliense, which reaches an adult diameter of at the most 15 cm. The bipartite ribs crossing the venter continue mostly on until the end of the bodychamber and can become irregular, whereas by C. crusoliense they tend to merge towards the end and remain relatively constant.
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Aptychi mostly existed as bilaterally symmetrical pairs and were part of the anatomy of many ammonites. They are believed to have been either a two-valved closing hatch at the aperture or else a double-plate jaw piece. These particular ones are associated with the ammonite genus Aspidoceras. The photo shows a pair in ventral and dorsal views.
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This little fellow is so small that I had to photograph it under the microscope. It's amazing that I found it at all. They don't get much bigger than this apparently. One of the dwarves under the ammonites. This is the microconch to Cymaceras guembeli.
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Taramelliceras (Metahaploceras) nodosiusculum (Fontannes 1879)
Ludwigia posted a fossil in Ammonoids
Calcified limestone mold. Phragmocone. -
Rasenia (Involuticeras) involuta (Quenstedt 1849)
Ludwigia posted a gallery image in Member Collections
From the album: Late Jurassic Ammonites from Southern Germany
10cm. The inner whorls of what would have been quite a large chap originally. Malm gamma 2. Lower Kimmeridgian. From the upper Danube Valley.-
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