Site KG- Triton Point (Cretaceous of Antarctica)

Where: Antarctica (72.0° S, 68.5° W: paleocoordinates 77.9° S, 48.5° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Triton Point Formation (Fossil Bluff Group), Late/Upper Albian (105.3 - 99.6 Ma)

Environment/lithology: "floodplain"; lithified sandstone

• The sedimentology of the Triton Point Formation has been studied separately in the northern part (Triton Point to Pagoda Ridge) and the southern part (Citadel Bastion to Titan Nunataks) of the field area. In the northern area, the sedimentary succession is interpreted as the product of a braided alluvial plain environment. In the southern, two distinctive sedimentary members are present. The lower unit, the Citadel Bastion Member, is interpreted as a braided alluvial plain deposit, whereas the upper unit, the Coal Nunatak Member (~130 m thick), is interpreted as a coastal plain meander belt deposit.
• SPECIFIC LITHOLOGY: Unknown lithology

•The Triton Point Formation consists of a wedge-like package of fluvial sedimentary rocks which thickens from 200 m at Triton Point in the north of the study area to c. 950 m at Citadel Bastion, Titan Nunataks and Coal Nunatak in the south.

Size class: macrofossils

Preservation: mold/impression, original cellulose

Collection methods: All specimens are housed at the British Antarctic Survey and catalogued with the prefix KG.

•The material was examined under an Olympus SZH-10 stereo microscope, and photographed using Kodak Technical Pan film. Line drawings were made using a

• camera lucida attached to the Olympus microscope. The following terms are used in the species synonymies for those taxa figured and listed by Jefferson (1981).

Primary reference: D. J. Cantrill and N. S. Nagalingum. 2005. Ferns from the Cretaceous of Alexander Island, Antarctica: Implications for Cretaceous phytogeography of the Southern Hemisphere. Review of Palaeobotany and Palynology [C. Jaramillo/J. Moreno]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 150511: authorized by Carlos Jaramillo, entered by Jessica Moreno on 10.09.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Sphenopteridae
  - Sphenopteridae
Sphenopteris sanjuliensis Cantrill and Nagalingum 2005
Polypodiopsida
  - Gleicheniaceae
Microphyllopteris unisora Cantrill and Nagalingum 2005
 Cyatheales - Polypodiidae
Coniopteris cf. frutiformis Douglas 1973 scaly tree fern
  - Osmundaceae
Phyllopteroides sp. Medwell 1954
Phyllopteroides antarctica Cantrill and Nagalingum 2005