CV 86-05, Cross Valley: Ypresian, Antarctica

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Asteroidea - Asteriidae
Sclerasterias zinsmeisteri n. sp. Blake and Aronson 1998
Asteroidea - Zoroasteridae
Zoroaster aff. fulgens Thomson 1873
Asteroidea - Paxillosida - Astropectinidae
Ctenophoraster downeyae Blake and Zinsmeister 1979
Asteroidea - Valvatida - Goniasteridae
Tesselaster clarki n. sp. Blake and Aronson 1998
see common names

Geography
Country:Antarctica
Coordinates: 64.3° South, 56.7° West (view map)
Paleocoordinates:63.4° South, 63.8° West
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Paleogene Epoch: Eocene
Stage: Ypresian 10 m.y. bin: Cenozoic 2
Key time interval: Ypresian
Age range of interval: 56 - 47.8 m.y. ago
Stratigraphy
Formation:La Meseta
Stratigraphic resolution:group of beds
Stratigraphy comments: Location places it within Telm 1-2. Likely from Telm 2 given the description of "starfish beds" in Stillwell & Zinsmeister (1992).
Lithology and environment
Primary lithology:brown siltstone
Lithology description: "fine buff silts"
Environment:prodelta
Geology comments: According to Stillwell & Zinsmeister (1992), "Telm2 strata are typically very fine grained. These strata were deposited below wave base or in a protected embayment as shown by the lack of current ripples, scour features, or evidence of reworking. Localized shell banks with a bioclastic fabric indicate occasional higher current energy and some distance of transport, although the distance of transport was minimal. The presence of local slump structures indicates that deposition of Telm2 may have occurred on a sloping unstable surface." These characteristics suggest a prodelta is the best interpretation.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Museum repositories:USNM
Metadata
Database number:81846
Authorizer:A. Hendy, M. Clapham Enterer:A. Hendy, M. Clapham
Modifier:M. Clapham Research group:marine invertebrate
Created:2008-07-16 14:38:39 Last modified:2019-08-17 16:09:08
Access level:the public Released:2008-07-16 14:38:39
Creative Commons license:CC BY
Reference information

Primary reference:
469. D. B. Blake and R. B. Aronson. 1998. Eocene stelleroids (Echinodermata) at Seymour Island, Antarctic Peninsula. Journal of Paleontology 72(2):339-353 [L. Ivany/E. Kowalski/L. Villier]