Sample 25, Puerto Rican Lignites B (Oligocene to of Puerto Rico)

Where: Puerto Rico (18.3° N, 66.9° W: paleocoordinates 17.4° N, 66.0° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: San Sebastian Formation (Rio Guatemala Group), Oligocene to Oligocene (33.9 - 23.0 Ma)

• 6 inch coal and lignitic clay.

• bed-level stratigraphic resolution

Environment/lithology: carbonaceous claystone and lignite

• Clay is lignitic and there is coal present.

Size class: microfossils

Preservation: original sporopollenin

Collection methods: bulk, chemical, mechanical,

Primary reference: A. Graham and D. L. Jarzen. 1969. Studies in neotropical paleobotany. I. The Oligocene communities of Puerto Rico. Annals of the Missouri Botanical Garden 56:308-357 [E. Kowalski/E. Kowalski/E. Kowalski]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 32290: authorized by Elizabeth Kowalski, entered by Elizabeth Kowalski on 17.06.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Faramea sp., "Fern" indet., Plantae indet.
Plantae indet. Haeckel 1866
Polypodiopsida
  - Polypodiaceae
Polypodiaceae indet.
Polypodiaceae indet. Presl and Presl 1822
 Cyatheales - Polypodiidae
Cyathea sp.
Cyathea sp. Smith 1793 scaly tree fern
Angiospermae
 Mesangiosperms - Arecaceae
"Palmae indet." = Arecaceae
"Palmae indet." = Arecaceae von Berchtold and Presl 1820 palm
Dicotyledoneae
 Ericales - Sapotaceae
Chrysophyllum sp.
Chrysophyllum sp. Linnaeus 1753
Angiospermae
 Malpighiales - Euphorbiaceae
Alchornea sp.
Alchornea sp. Swartz 1788 spurge
 Malpighiales - Rhizophoraceae
Rhizophora sp.
Rhizophora sp. Linnaeus 1753 true mangrove
 Fagales - Juglandaceae
Engelhardia sp.
Engelhardia sp. Blume 1825