Sample 8, Puerto Rican lignites: Oligocene - Late Oligocene, Puerto Rico

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
2 %-specimens
Angiospermae - Malpighiales - Rhizophoraceae
96 %-specimens
Angiospermae - Fagales - Juglandaceae
1 %-specimens
Angiospermae - Ericales - Tetrameristaceae
1 %-specimens
see common names

Geography
Country:Puerto Rico
Coordinates: 18.3° North, 66.9° West (view map)
Paleocoordinates:19.3° North, 61.1° West (Wright 2013)
Basis of coordinate:based on political unit
Geographic resolution:outcrop
Time
Period: Paleogene Epoch: Oligocene
10 m.y. bin: Cenozoic 4
*Period:Middle Tertiary *Epoch:Middle Oligocene - Late/Upper Oligocene
Key time interval: Oligocene - Late Oligocene
Age range of interval: 33.9 - 23.04 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Rio Guatemala Formation:San Sebastian Local bed:upper lignite
Stratigraphic resolution:bed
Lithology and environment
Primary lithology: carbonaceous claystone
Secondary lithology: lignite
Includes fossils?Y
Lithology description: Clay is lignitic.
Taphonomy
Modes of preservation:body,original sporopollenin
Size of fossils:microfossils
Spatial orientation:random
Preservation of anatomical detail:excellent
Collection methods and comments
Collection excludes:some microfossils,species names
Collection methods:bulk,chemical,mechanical,field collection
Reason for describing collection:taxonomic analysis
Metadata
Database number:32284
Authorizer:E. Kowalski Enterer:E. Kowalski
Modifier:E. Kowalski Research group:paleobotany
Created:2003-06-17 16:33:42 Last modified:2025-02-22 15:12:02
Access level:the public Released:2003-06-17 16:33:42
Creative Commons license:CC0
Reference information

Primary reference:
8693. 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]