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- Title
Upper Albian ammonites from ODP Leg 171B off northern Florida.
- Authors
LEHMANN, JENS; Lehmann, Jens
- Abstract
ODP Leg 171B investigated the sediments of the Blake Plateau off northern Florida and recovered 36 Upper Albian ammonites - one from Site 1050C, the others from Site 1052E. This unusually large number of specimens from an ODP site permits the dating of the interval between 668 to 621 m below sea-floor at Site 1052E as late Late Albian,<E1>Stoliczkaia</E1>(<E1>S</E1>.)<E1>dispar</E1>ammonite zone. This zone is indicated by the genera<E1>Mortoniceras</E1>and<E1>Stoliczkaia</E1>(<E1>S.</E1>). Site 1050C (Interval 171B-1050C-31R-3, 0.80-0.86 m) cannot be dated more precisely than Late Aptian to Mid Cenomanian by ammonites. The fauna is cosmopolitan.<E1>Tetragonites jurinianus</E1><E1>Puzosia mayoriana</E1>are widely distributed forms.<E1>Kossmatella muhlenbecki</E1>was thought to be restricted to a fairly small area around the Mediterranean, but the record off northern Florida presented here, indicates that it is not an endemic species; this is also true for<E1>Hemiptychoceras subgaultinum</E1>in the Albian. The event-like character of the ammonite-bearing interval at Site 1052E is unique. It is overlain by a laminated claystone succession; the top of this sequence is considered to represent maximum flooding (Oceanic Anoxic Event, OAE 1d). Ammonites perhaps profited from an increased nutrient supply derived from flooded coastal plains during a continuous transgression.
- Subjects
BLAKE Plateau; FLORIDA; UNITED States; AMMONOIDEA; SEDIMENTS; CRETACEOUS stratigraphic geology
- Publication
Palaeontology, 2000, Vol 43, Issue 1, p41
- ISSN
0031-0239
- Publication type
Article
- DOI
10.1111/1475-4983.00118