期刊
JOURNAL OF THE GEOLOGICAL SOCIETY
卷 157, 期 -, 页码 201-205出版社
GEOLOGICAL SOC PUBL HOUSE
DOI: 10.1144/jgs.157.1.201
关键词
ammonites; Lower Jurassic; concretions; jaws; taphonomy
The occurrence of ammonite jaw apparatuses in situ within concretions from the Sinemurian (Lower Jurassic) of Black Ven Cliff, Charmouth, Dorset, provides evidence of burial of the ammonites with soft parts intact and this is of importance in considering the origin of the concretions. The lower jaws (anaptychi) of arietitid and eoderoceratid ammonites are preserved and three examples of upper jaws are recorded in the species Asteioceras stellare. Although usually accepted as being entirely of organic composition, the anaptychi of A. stellare have an outer calcareous layer.
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