Hidden Lake B15: Coniacian - Early/Lower Santonian, Antarctica

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Nyssapollenties spp. microspore
Orthothecida
Actinotheca aphroditae marine palyn Cookson and Eisenack 1960
Pteridopsida
Ischyosporites volkheimeri microspore Filatoff 1975
Polypodiopsida - Dicksoniaceae
Cyatheacidites annulatus microspore Cookson 1947
Polypodiopsida - Osmundaceae
Rugulatisporites mallatus microspore Stover 1973
Polypodiopsida - Gleicheniaceae
Clavifera triplex microspore Bolkhovitina 1966
Ornamentifera informal sp. A microspore Bolkhovitina 1966
Coniferales - Podocarpaceae
Microcachryidites antarcticus microspore Couper 1953
Phyllocladidites mawsonii microspore Cookson 1947
Magnoliopsida
Tricolporites informal sp.1 microspore Cookson 1947
Angiospermae - Proteales - Proteaceae
Proteacidites informal sp.1 microspore Cookson and Couper 1953
Proteacidites informal sp.2 microspore Cookson and Couper 1953
Angiospermae - Liliaceae
Liliacidites informal sp.1 microspore Couper 1953
Angiospermae
Brenneripollis peroreticulatus microspore Brenner 1963
replaced by Retimonocolpites reticulatus
Marchantiopsida - Marchantiidae
Stoverisporites microverrucatus microspore Burger 1975
unclassified
Dryadopollis informal sp.1 microspore Srivastava 1977
Lycopodiopsida - Selaginellales
Densoisporites velatus microspore Dettmann 1963
Lycopodiopsida - Selaginellales - Selaginellaceae
Herkosporites elliottii microspore Stover 1973
unclassified
Pterospermella eurypteris marine palyn
Dinophyceae - Peridiniales - Deflandreaceae
Spinidinium balmei marine palyn
Dinophyceae - Peridiniales - Peridiniaceae
Trithyrodinium informal sp.2 marine palyn Drugg
Palaeohystrichophora infusorioides marine palyn Deflandre 1936
Dinophyceae
Spiniferites ramosus marine palyn Lentin and Williams 1973
S. ramosus cf. gracilis
Dinophyceae - Gonyaulacales
Dapsilidinium laminaspinosum marine palyn Davey and Williams 1966
Dinophyceae - Gonyaulacales - Gonyaulacaceae
Impagidinium spp. marine palyn
Dinophyceae - Gonyaulacales - Ceratiaceae
Xenascus spp. marine palyn
see common names

Geography
Country:Antarctica
Coordinates: 63.9° South, 58.0° West (view map)
Paleocoordinates:65.2° South, 61.9° West
Basis of coordinate:estimated from map
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
10 m.y. bin:Cretaceous 6
Key time interval:Coniacian - Early/Lower Santonian Pollen zone: Phyllocladidites mawsonii
Age range of interval:89.80000 - 83.60000 m.y. ago
Stratigraphy
Geological group:Gustav Formation:Hidden Lake
Stratigraphic resolution:bed
Stratigraphy comments: The Hidden Lake Formation is considered Coniacian-Early Santonian in age taking into account the recognition of the Australian, Phyllocladidites mawsonii spore-pollen Zone and Conosphaeridium striatoconus and Odontochitina porifera dinoflagellate cyst Zones. The associate megafauna confirms this age.
Lithology and environment
Primary lithology: calcareous,carbonaceous sandstone
Includes fossils?Y
Lithology description: La base grada desde areniscas gruesas a conglomerados finos a medianos con intercalaciones de bancos de areniscas con alto porcentaje de material volcaniclástico. Hacia arriba disminuye la granulometría, predominando las areniscas finas limosas muy bioturbadas. La estratificación entrecruzada en artesada y la gradación normal son las estructuras mas importantes.
Environment:delta plain
Geology comments: "a developing distributary plain in the central fan of a fan delta depositional system", also called "nearshore marine"
Taphonomy
Modes of preservation:original sporopollenin
Size of fossils:microfossils
Fragmentation:occasional
Spatial resolution:autochthonous
Collection methods and comments
Collection methods:surface (in situ),hydrochloric,hydroflouric,field collection
Reason for describing collection:biostratigraphic analysis
Collection method comments: Los preparados se encuentran depositados en la palinoteca del Centro de Investigaciones en Recursos Geológicos bajo la sigla CIRGEO Palin y los números de catálogo 1053 a 1124.
Taxonomic list comments:A partir de la muestra B13 se reconoce una asociación esporopolínica variada, pero con algunas presencias significativas como la de Rugulatisporites mallatus y Tricolporites sp. 1, primero con apariciones saltuarias pero luego documentándose regularmente hacia la parte superior de la Formación Hidden Lake y la base de la Formación Santa Marta.
Metadata
Also known as:Hidden Lake
Database number:169331
Authorizer:C. Jaramillo Enterer:C. Jaramillo
Research group:micropaleontology
Created:2015-05-19 22:39:29 Last modified:2015-05-19 22:39:29
Access level:the public Released:2015-05-19 22:39:29
Creative Commons license:CC BY
Reference information

Primary reference:
55274.fossil record V. D. Barreda, S. Palamarczuk, and F. Medina. 1999. Palinología de la Formación Hidden Lake (Coniaciano-Santoniano), Isla James Ross, Antártida. Revista Española de Micropaleontología (31)53-72 [C. Jaramillo/C. Jaramillo]