Half Three Point assemblage: Late Campanian - Early Maastrichtian, Antarctica

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Sphenopteridae
Sphenopteris informal sp. Sternberg 1825
unclassified
Cranwellia informal sp. Srivastava 1966
Equisetopsida - Araucariaceae
Araucariacites informal sp. Cookson and Couper 1953
Araucariacites australis Cookson 1947
Equisetopsida
Foraminisporis dailyi Dettmann 1963
unclassified
Gnetaceaepollenites informal sp. Thiergart 1938
Gnetaceaepollenites ellipticus Thiergart 1938
Cibotiumspora informal sp. Chang 1965
Lycopsida
Foveotriletes scrobiculatus Potonié 1956
Pteridopsida
Deltoidospora informal sp. Miner 1935
Deltoidospora microlepioides Wang 1981
Deltoidospora hallii Miner 1935
Cyathidites informal sp. Couper 1953
Cyathidites minor Couper 1953
Cyathidites cf. minor Couper 1953
Cyathidites pulchellus Cao 1994
Leiotriletes informal sp. 1
Leiotriletes informal sp. 2
Osmundacidites informal sp. Couper 1953
Polypodiopsida - Polypodiales
Polypodiisporites informal sp. Potonié 1931
Polypodiisporites favus Potonie 1956
Polypodiopsida - Cyatheales - Cyatheaceae
Alsophilidites informal sp. Cookson
Alsophilidites kerguelensis Cookson 1947
Polypodiopsida - Schizaeales - Schizaeaceae
Undulatisporites informal sp. Pflug 1953
Klukisporites antarcticus Cao 1994
Polypodiopsida - Schizaeales
Appendicisporites informal sp. Weyland and Greifeld 1953
Polypodiopsida - Gleicheniaceae
Gleicheniidites informal sp. Dettmann 1963
Gleicheniidites senonicus Ross 1949
Gleicheniidites trivalvis Cao 1994
Gleicheniidites cf. delcourtii Döring 1965
Gleicheniidites fildesensis Cao 1994
Gleicheniidites pachydermus Cao 1994
Gleicheniidites campanianus Cao 1994
Clavifera informal sp. 1
Clavifera informal sp. 2
Clavifera triplex Bolkhovitina 1966
Clavifera jachromensis Bolkhovitina 1968
Polypodiopsida
Verrucosisporites informal sp. Potonie and Kremp 1954
? Biretisporites informal sp. Delcourt et al. 1963
Marchantiopsida - Sphaerocarpales
Aequitriradites spinulosus (Cookson and Dettmann 1958)
Sphagnaceae
Sphagnumsporites informal sp. Raatz 1956
Lycopodiopsida - Isoetales - Isoetaceae
Echinosporis informal sp. 1
Echinosporis informal sp. 2
Lycopodiopsida - Selaginellales - Selaginellaceae
Neoraistrickia truncata Potonié 1956
Angiospermae - Malpighiales - Euphorbiaceae
Tricolporopollenites informal sp. 1
Tricolporopollenites informal sp. 2
Angiospermae - Fagales
Nothofagidites informal sp. Potonié 1960
Nothofagidites cf. endurus Stover and Evans 1973
Nothofagidites cf. rocaensis Romero 1973
Nothofagidites cf. brachyspinulosus Harris 1965
Nothofagidites cf. senectus Dettmann and Playford 1968
Angiospermae - Fagales - Nothofagaceae
Nothofagus informal sp. Blume 1850
similar to N. magelhaenica
Angiospermae - Proteales - Proteaceae
Triporopollenites informal sp. Pflug and Thomson 1953
Angiospermae - Santalales - Loranthaceae
Gothanipollis bassensis Stover 1973
Magnoliopsida
Dicotylophyllum informal sp. Saporta 1894
=Dicotylophyllum sp. 2 of Li & Song in Zhou & Li, 1994
Pinopsida - Pinales - Taxaceae
? Abietineaepollenites microalatus
Coniferales - Podocarpaceae
Podocarpidites ellipticus Cookson 1947
Microcachryidites informal sp. Cookson 1947
Podocarpus informal sp. L'Heritier and Persoon 1807
Podocarpus fildesensis Zhou 1994
Phyllocladidites informal sp. Cookson 1947
unclassified
Baltisphaeridium informal sp. Eisenack 1958
Fractisporonites informal form 1
Fractisporonites informal form 2
Fractisporonites informal form 3
Fractisporonites informal form 4
Fractisporonites informal form 5
Reduviasporonites informal sp. 1
Reduviasporonites informal sp. 2
Extrapunctatosporis informal sp. Krutzsch 1959
Bivalvia - Mytilida - Mytilidae
Dacrydium informal sp. Torell 1859
unclassified
? Diporicellaesporites informal sp 1
? Diporicellaesporites informal sp. 2
Diporicellaesporites stenosus Song and Cao 1994
Diporicellaesporites antarcticus Song and Cao 1994
Dicellaesporites informal spp. Elsik
Dicellaesporites oblongatus Song and Cao 1994
Dicellaesporites antarcticus Song and Cao 1994
Dicellaesporites popovii Elsik 1968
Multicellaesporites informal sp. 1
Multicellaesporites informal sp. 2
Multicellaesporites informal sp. 3
? Multicellaesporites cf. ellipticus Sheffy and Dilcher 1971
Multicellaesporites cf. ovatus Sheffy and Dilcher 1971
Staphlosporonites informal sp. Sheffy and Dilcher
Dyadosporites informal sp. Hammen
Dyadosporites obscurus Song and Cao 1994
Lacrimasporonites tenuous Song and Cao 1994
Lacrimasporonites scabratus Song and Cao 1994
Inapertisporites solidus Song and Cao 1994
Inapertisporites cf. obpyriformis Sheffy and Dilcher 1977
Pluricellaesporites informal sp. Hammen
Pluricellaesporites antarcticus Song and Cao 1994
Pluricellaesporites ocellatus Song and Cao 1994
Asterisporites informal sp. Venkatachala and Rawat 1971
? Involutisporonites crassus Song and Cao 1994
Cupulisporonites megaporus Song and Cao 1994
Brachysporisporites informal spp. Song and Cao 1994
Brachysporisporites grandus Song and Cao 1994
Brachysporisporites longovatus Song and Cao 1994
Brachysporisporites ovoidus Song and Cao 1994
Brachysporisporites antarcticus Song and Cao 1994
Plicifera informal sp. Bolchovitina 1966
Plicifera trialatus Cao 1994
Plicifera delicata Bolchovitina 1968
Plicifera decora Bolkhovitina 1968
see common names

Geography
Country:Antarctica
Coordinates: 62.2° South, 59.0° West (view map)
Paleocoordinates:60.1° South, 69.3° West
Basis of coordinate:stated in text
Altitude:9 meters
Geographic resolution:outcrop
Time
Period: Cretaceous Epoch: Late Cretaceous
Stage: Campanian - Maastrichtian 10 m.y. bin: Cretaceous 7 - Cretaceous 8
Key time interval: Late Campanian - Early Maastrichtian
Age range of interval: 83.6 - 66 m.y. ago
Stratigraphy
Formation:Half Three Point
Stratigraphic resolution:formation
Lithology and environment
Primary lithology:tuffaceous lithified muddy mudstone
Secondary lithology:tuffaceous lithified sandy sandstone
Includes fossils?Y
Lithology description: The plant-bearing beds comprise a short section (c. 4 m) of dark grey tuffs and tuffaceous sandstones, siltstones and mudstones that dip 26ENE. These are finely laminated with normal gradation and intercalations of coal beds in mudstones.
Environment:fluvial-lacustrine indet.
Geology comments: On the basis of the high content of fungal, bryophyte and pteridophyte remains recorded, Shen (1994) considered the plant debris to be autochthonous, and to have been deposited in a lake during a warm (subtropical), humid climatic interval, although those in the braided river deposits will inevitably have been transported some distance from the source flora.
Taphonomy
Modes of preservation:body,soft parts,original sporopollenin
Size of fossils:microfossils
Temporal resolution:time-averaged
Spatial resolution:autochthonous
Collection methods and comments
Collection excludes:all macrofossils,some microfossils
Collection methods:bulk,chemical,hydrochloric,hydroflouric,field collection
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:150237
Authorizer:C. Jaramillo Enterer:P. Santamarina
Modifier:P. Santamarina Research group:micropaleontology,paleobotany
Created:2013-09-04 06:43:42 Last modified:2013-09-04 08:38:26
Access level:authorizer only Released:2018-09-04 06:43:42
Creative Commons license:CC BY
Reference information

Primary reference:
48067. T. L. Dutra and D. J. Batten. 2000. Upper Cretaceous floras of King George Island, West Antarctica, and their palaeoenvironmental and phytogeographic implications. Cretaceous Research (21)181-209 [C. Jaramillo/P. Santamarina]