Sample from the Mumienbank, the top bed of the Middle Hauptrogenstein.
Oncoid with a gastropod nucleus. Probably a nerinea.
Detail from a polished slap of the Middle Hauptrogenstein. Somewhere from the "cross-stratified, oolithic complex" or coral-bearing Hauptrogenstein. Shells are 3 to 4 mm in size. Unidentified.
Gastropod sample from the coral-bearing Hauptrogenstein in close association with abundant coral debris (not recognisable in foto). A nerinean?
Wonderful 3D preservation of an archaeogastropoda(?) in close association with well-preserved, probably in-situ occurence, of branching corals (see below).
Branching-coral associated with the above mentioned gastropod fossil. Possibly encrusted with coraline algae?
3 comments:
Cool! I especially like the 3D fossil shell. The things in the 2nd photo do look like snail shells, but not being a geologist or a paleontologist, I can't rule out anything else.
Nice photos--nice fossils!
In your second photo, the fossil at the bottom is a foraminifer, which you can distinguish by the arrangement of the chambers. The chambers start out in a "biserial" arrangement, not seen in gastropods (which of course have only one chamber), then become "uniserial". There are several genera that show this arrangement, but most are more recent than Jurassic; one possibility is Bigenerina, which ranges from Jurassic to Recent. The other two fossils in the same photo are probably small gastropods, though the one on the right could be a uniserial foraminifer, something along the lines of Dentalina, which is also the right age.
Cheers,
--Howard
Thanks Howard! That's some great clues you could share. I actually agree on the bottom one. I already thought it looks too odd for a snail with that un-snail-like chamber arrangment.
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