La Meseta Seymour Island, Unit III: Priabonian, Antarctica

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Avetheropoda
Sphenisciformes indet. Sharpe 1891
Mitchell 1989
Mammalia - Cetacea
Dorudontinae indet. (Miller 1923)
Borsuk-Bialynicka 1988
    = Cetacea indet. Brisson 1762
Uhen 2500
Mammalia - Cetacea - Basilosauridae
Zygorhiza sp. True 1908
Cozzuol 1988 1 specimen
It is not clear e
    = Basilosauridae indet. Cope 1867
Uhen 2013
Basilosauridae indet. Cope 1867
Cozzuol 1988
Mammalia - Cetacea - Llanocetidae
? Zeuglodon sp. Owen 1839
1 specimen
    = Llanocetus denticrenatus n. gen., n. sp. Mitchell 1989
Mitchell 1989
see common names

Geography
Country:Antarctica
Coordinates: 64.2° South, 56.6° West (view map)
Paleocoordinates:64.3° South, 58.5° West
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period:Paleogene Epoch:Eocene
Stage:Priabonian 10 m.y. bin:Cenozoic 3
Key time interval:Priabonian
Age range of interval:38.00000 - 33.90000 m.y. ago
Age estimate:34.2 to 34.0 Ma (other)
Stratigraphy
Formation:La Meseta Member:Unit III
Stratigraphic resolution:member
Stratigraphy comments: La Meseta Unit III of Zinsmeister and Camacho (1982); Submeseta according to Reguero et al., 2013

Strontium dating indicates Telm 7 to have been deposited between 39.1 and 34.0 Ma [148]. Samples from near the top of the formation fall closest to the presumed fossil horizon [145, 147], thus indicating an age of 34.2–34.0 Ma [148, 149]. (Marx & Fordyce, 2015)
Lithology and environment
Primary lithology:fine,medium sandstone
Includes fossils?Y
Lithology description: homogeneous medium to fine-grained, moderately to well-sorted sand
Environment:lagoonal
Geology comments: shallow marine or strand line conditions, shallow, nearshore; estuary and delta, with tidal flats, channels, and inlets; tide-dominated
Taphonomy
Modes of preservation:body,mold/impression,original phosphate
Size of fossils:macrofossils
Preservation of anatomical detail:good
Associated major elements:some
Collection methods and comments
Collection methods:surface (float),field collection
Reason for describing collection:taxonomic analysis
Museum repositories:USNM
Metadata
Database number:45723
Authorizer:M. Uhen Enterer:M. Uhen
Modifier:B. Shipps Research group:vertebrate
Created:2004-11-29 06:51:21 Last modified:2017-02-26 15:36:56
Access level:the public Released:2004-11-29 06:51:21
Creative Commons license:CC BY
Reference information

Primary reference:

57928. D. H. Elliot, C. Rinaldi, W. J. Zinsmeister, T. A. Trautman, W. A. Bryant and R. Valle. 1975. Geological investigations on Seymour Island, Antarctic Peninsula. Antarctic Journal 10(4):182-186 [M. Uhen/M. Uhen]

Secondary references:

15047 M. Borsuk-Bialynicka. 1988. New remains of Archaeoceti from the Paleogene of Antarctica. Polish Polar Research 9(4):437-445 [M. Uhen/M. Uhen]
40308 M. A. Cozzuol. 1988. Comentarios sobre los Archaeoceti: (Mammalia: Cetacea) de la Isla Vicecomodoro Marambio, Antartida. Yornadas Argentinas de Paleontologia de Vertebrados Resumens 5:32 [M. Uhen/M. Uhen]
55050 F. G. Marx and R. E. Fordyce. 2015. Baleen boom and bust: a synthesis of mysticete phylogeny, diversity and disparity. Royal Society Open Science 2:140434 [M. Uhen/M. Uhen]
12039 E. D. Mitchell. 1989. A new cetacean from the late Eocene La Meseta Formation, Seymour Island, Antarctic Peninsula. Canadian Journal of Fisheries and Aquatic Sciences 46(12):2219-2235 [M. Uhen/M. Uhen/M. Uhen]
47119 M. Reguero, F. Goin, C. A. Hospitaleche, S. Marenssi, and T. Dutra. 2013. The Terrestrial Biotic Dimension of West Antarctica. SpringerBriefs in Earth System Sciences 55-110 [M. Uhen/M. Uhen]
40307 M. A. Reguero and Z. Gasparini. 2007. Late Cretaceous-Early Tertiary marine and terrestrial vertebrates from james Ross Basin, Antarctic Peninsula: A review. In J. Rabassa, M. L. Borla (eds.), Antarctic Peninsula & Tierra del Fuego 55-76 [M. Uhen/M. Uhen]
42488 M. D. Uhen. 2013. A review of North American Basilosauridae. Alabama Museum of Natural History Bulletin 31(2):1-45 [M. Uhen/M. Uhen/M. Uhen]