Bucarú Fm
Period:
Paleogene
Age Interval:
Eocene - Woodring (1960)
Province:
Burica Peninsula
Type Locality and Naming
Sapper (1937). Name Búcaro appears in correlation chart.
References: See more in “Additional information”.
Synonym: Búcaro Fm, Bucaru Fm, Bucarú Fm, Búcaru Fm; Bucaru Fm
Lithology and Thickness
Exposed thickness of Eocene rocks north of Guanico Point is about 2,000 feet. Lower beds are coarse dark-gray sandstones, conglomerates, and sandy shales. These beds are followed by about 1,500 feet of blue-green or black shales with thin gritty sandstones; in their lower part are several fossil zones, the lower about 50 feet above base of section.
Lithology Pattern:
Clayey sandstone
GeoJSON
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Fossils
The mollusks include Aturia peruviana [nautiloid], Noetiopsis woodringi, and Venericardia tonosiensis (Olsson,1942b (pages 235-236)).
Age
Age Span:
Beginning stage:
Ypresian
Fraction up in beginning stage:
0
Beginning date (Ma):
56.00
Ending stage:
Bartonian
Fraction up in the ending stage:
0
Ending date (Ma):
41.03
Depositional setting
Depositional pattern:
Additional Information
- Senn (1940, pages 1578, 1589). Used the misspelled name of “Bucarú Fm”, without accent.
- Olsson (1942b, pages 235-236). Referred to as Bucarú Fm. Exposed thickness of Eocene rocks north of Guanico Point is about 2,000 feet. Lower beds are coarse dark-gray sandstones, conglomerates, and sandy shales. These beds are followed by about 1,500 feet of blue-green or black shales with thin gritty sandstones; in their lower part are several fossil zones, the lower about 50 feet above base of section. Underlies David Fm. The mollusks include Aturia peruviana [nautiloid], Noetiopsis woodringi, and Venericardia tonosiensis.
- Terry (1956, page 29). Used the spelling Búcaru
- Wilson et al. (1957).
- Woodring (1960). On north side of Point near Búcaro, is in fault contact with volcanics; to south grades downward into volcanics. Lexicon uses Búcaro as preferred spelling. Near village of Búcaro, Los Santos Province. Confirmed that the proper spelling is Búcaro Fm. The formation extends northward up the lower part of the valley of Río Tonoso. Near Búcaro the basal part grades downward into basaltic agglomerate.
- Keroher et al. (1966).
Compiler:
Jacques LeBlanc (2021), Stratigraphic Lexicon: The Onshore Cenozoic Sedimentary Formations of The Republic of Panama. Biosis: Biological Systems, 2(1), 173 pp. https://doi.org/10.37819/biosis.002.01.0095 (or via https://sites.google.com/site/leblancjacques)