Journal
PALAEONTOLOGY
Volume 55, Issue -, Pages 1307-1331Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1475-4983.2012.01196.x
Keywords
Ammonoidea; radula; buccal mass; Lagerstatte; Cretaceous; north-west Germany
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Funding
- German Research Foundation (DFG)
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From thinly laminated marlstones of the Hesseltal Formation, representing the Late Cenomanian Oceanic Anoxic Event (OAE) 2, at Lengerich in the Teutoburger Wald (Westfalen, north-west Germany), 17 sediment-compacted baculitid ammonites with carbonised and partially phosphatised soft parts are recorded. Some preserve remains of the buccal mass, including jaws (occasionally articulated) and radulae, as well as of the cephalic cartilage, such as eye capsules. Such have not yet been recorded previously for the order Ammonoidea. In addition, originally unmineralised parts found preserved in these specimens include extensive portions of the digestive tract, the siphonal tube, false colour patterns (megastriae), as well as traces of what would appear to be the oviduct. At the same levels, patches with numerous isolated horny upper and rarer lower jaws as well as radulae occur; these may represent regurgitates or faeces of larger predators. The cephalopod remains described were deposited in an epicontinental setting, possibly at palaeodepths between 200 and 600 m. In this particular Late Cretaceous fossil Lagerstatte, upper jaws and anaptychi of ammonites rank among the commonest fossils.
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