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Showing results for tags 'staufenia'.
Found 11 results
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From the album: Middle Jurassic Ammonites from Southern Germany
Not quite identical twins measuring 16 & 18cm. bradfordensis zone, staufensis bank Late Aalenian From the Wutach Valley -
From the album: Middle Jurassic Ammonites from Southern Germany
9cm. This species gives its name to the Staufensis Bank, which appears in certain sections of the Bradfordensis Subzone of the Murchisonae Zone, Upper Aalenian, Middle Jurassic. It is quite common to find them in the Wutach area, but the stone is so hard and the discus-shaped ammonites so fragile, that it's difficult to extricate a well-preserved specimen without damageing it in some way. This one lost much of its shell, exposing the impressions of the sutures on the calcite core and also giving a view into the crystallized chambers of the phragmocon. -
From the album: Middle Jurassic Ammonites from Southern Germany
12cm. in circumference. Another one from the Wutach. Upper Aalenian. I found this one a long time ago before I knew any better and unfortunately almost destroyed the living chamber before I realized what I was doing. Haven't found any more of this species since then though, so it's still in the collection. PS in Dec.2012. I've just changed the ID from S.discoidea to S.sehndensis. We've just discovered that this is only the second of its kind identified in the Wutach area. -
From the album: Middle Jurassic Ammonites from Southern Germany
14cm. in circumference. Another one from Wutach. Upper Aalenian. -
From the album: Middle Jurassic Ammonites from Southern Germany
9,5cm. Wutach Valley find. Upper Aalenian. -
From the album: Middle Jurassic Ammonites from Southern Germany
19x11x4cm. Left: Staufenia sehndensis. Middle: Ancolioceras opalinoides. Right: Ludwigia haugi. From the murchisonae Zone, upper Aalenian, middle Jurassic in the Wutach Valley. -
I mentioned in another post a few days ago that I had discovered a site in the Middle Jurassic Aalenian which I hadn't visited previously. I found it rather unexpectedly while in search of the humphriesi oolite formation. It was obvious that other collectors had worked here in the past, but the rock had also been weathering away for a few years since the last ones were here, so I figured it would be worth spending the good part of a day inspecting it. I set off to this avail this very morning. It's a bit of a way up to get there, but not too strenuous if you take your time. By the way, I remembered to take my camera along this time, so here's a shot of the exposure. I spent about 5 hours working at it but ended up digging out a lot of partials since the stone was extremely hard at the one productive horizon and too soft in the other one. That's the luck of the game sometimes. You can always find the right horizon once you've located an exposure, but the preservation is often quite different than at other exposures not too far away. Here are pics of the 2 spots I was working at. It wasn't all for nothing at least, since I did manage to salvage a good sized Staufenia staufensis ammonite out of the hard horizon. This is how it looked before I maneuvered the 2nd block out of the bank. And here are both pieces ready for transport. Looks like I've got a bit of prep work ahead of me. There were also a few smaller ones to take with me. So that was it for the day. Downhill is always as easy as pie and a stop on the way home for a rump steak with scalloped potatoes and a red bull is the incentive that gets me out in the first place I'll post the finds later on once I get down to prepping them.
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From the album: Middle Jurassic Ammonites from Southern Germany
Staufenia sehndensis (10cm.) with Ludwigia haugi (5cm.) from the late Aalenian murchisonae zone in the Wutach Valley. -
A complete specimen with the shell preserved on one side. The transition from phragmocone to body chamber can be seen on the mold on the reverse side where the shell no longer exists.
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Almost complete with the shell partially preserved. Old German Chronostraigraphy: Dogger (Braunjura) beta 1
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The samples of this species at this site are practically impossible to extract in one piece due to the large size and the discus-like shape of the fossil and also to the hardness and cleavage of the matrix. Therefore this one was extracted in several pieces which were then glued back together. All remaining cracks and crevices were then filled in with stonemeal. What we see here is just a complete phragmocone, which is apparent through the suture lines visible on the calcite mold seen in the second photo, where the shell broke off during extraction. The complete creature with body chamber probably had a diameter of ca. 40cm. This is the index fossil of this particular horizon. An Homaloteuthis sp. belemnite rostrum is attached at the mouth aperture. Biostratigraphy: Bradfordensis Zone, bradfordensis subzone, staufensis bank Old German Chronostratigraphy: Dogger (Braunjura) beta Literature: Rieber,H. (1963): Ammoniten und Stratigraphie des Braunjura beta der Schwaebischen Alb, Palaeontographica Bd.122,Abt.A, Pp.1-89
