Where: Seymour Island, Antarctica (64.3° S, 56.9° W: paleocoordinates 62.3° S, 67.7° W)
• coordinate estimated from map
• small collection-level geographic resolution
When: López de Bertodano Formation (Seymour Island Group), Late/Upper Campanian to Late/Upper Campanian (83.5 - 66.0 Ma)
• Section A9 have 140 - 150 m. The section contains 20 samples: 01-20.
•
•The formation was subdivided into 10 lithologic units by Macellari (1984b, 1988). Units 1 to 9 (~1100 m thick) span the upper Campanian and Maastrichtian,and the uppermost Unit 10 (up to 90m thick) is Tertiary (Danian).The formation is disconformably overlain by deltaic sediments of the Paleocene Sobral Formation.
• formation-level stratigraphic resolution
Environment/lithology: marginal marine; silty, sandy lithology not reported
•
•Although Mesozoic tectonic reconstructions of the Antarctic Peninsula- South America region are not universally accepted, it is generally agreed that the James Ross Island basin contains sedimentary and volcanic strata deposited in a back-arc terrain (e.g. Elliot 1988).
Size class: microfossils
Preservation: original sporopollenin
Reposited in the USNM
Collection methods: chemical,
• Spores from the Cretaceous part of the Lopez de Bertodano Formation discussed here are from a discontinuous section ( A5 through A11) collected during reconnaisance field-work in 1982, and section B1 collected in 1983/84. Another 12 samples from section A19 were examined. Samples were taken from holes dug about 10-30 cm into well-exposed outcrop, in part to avoid surficial slope wash. Surface weathering was not significantat most of these localities, although samples were collected from freshly exposed escarpments where possible.
•
•Material will be housed in the National Museum of Natural History, Smithsonian Institution, Washington, D.C.
Primary reference: R. A. Askin. 1990. Cryptogam spores from the upper Campanian and Maastrichtian of Seymour Island, Antarctica. Micropaleontology (36)141-156 [C. Jaramillo/C. Jaramillo]more details
Purpose of describing collection: paleoecologic analysis
PaleoDB collection 167585: authorized by Carlos Jaramillo, entered by Carlos Jaramillo on 24.03.2015
Creative Commons license: CC BY (attribution)
Taxonomic list
Lycopodiopsida | |
Ceratosporites equalis Cookson and Dettmann 1958 clubmoss
Camarozonosporites ohaiensis Dettmann and Playford 1968 clubmoss
Camarozonosporites ambigens Playford 1971 clubmoss | |
Retitriletes austroclavatidites Döring et al. 1963 clubmoss
Retitriletes nodosus Srivastava 1975 clubmoss
Retitriletes cf. eminulus Srivastava 1975 clubmoss | |
Echinosporis "sp. 1" Krutzsch 1967 clubmoss | |
Marchantiopsida | |
Triporoletes reticulatus Playford 1971 | |
Bryopsida | |
Stereisporites regium Drugg 1967
Stereisporites antiquasporites Dettmann 1963 | |
Pteridopsida | |
Osmundacidites wellmanii, Grapnelispora cf. evansii, Cyathidites sp., Cyathidites minor, Cyathidites cf. minor, Cyathidites australis
Osmundacidites wellmanii Couper 1953
Grapnelispora cf. evansii Stover and Partridge 1984
Cyathidites sp. Couper 1953
Cyathidites minor Couper 1953
Cyathidites cf. minor Couper 1953
Cyathidites australis Couper 1953 | |
Polypodiopsida | |
Laevigatosporites ovatus Wilson and Webster 1946
Laevigatosporites major Krutzsch 1959 | |
Baculatisporites comaumensis Potonie 1953 | |
Gleicheniidites circinidites Dettmann 1963 |