The crustacean ichnofossil Palaxius associated with callianassid body fossils in an Eocene methane-seep limestone, Humptulips Formation, Olympic Peninsula, Washington

Senowbari-Daryan B (2007)


Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2007

Journal

Book Volume: 40

Pages Range: 273-280

Journal Issue: 3

DOI: 10.1111/j.1502-3931.2007.00026.x

Abstract

Crustacean microcoprolites are preserved along with crustacean megafossils in an Eocene limestone within the Humptulips Formation in Grays Harbor County, Washington. The limestone formed at a methane seep, as revealed by early diagenetic carbonate phases resembling those of other seep limestones, δ13Ccarbonate values as low as −27‰, and lipid biomarkers of prokaryotes involved in anaerobic oxidation of methane with δ13C values as low as −110‰. Recognizable crustacean megafossils are chiefly isolated chelipeds, akin to those of callianassid shrimp. The microcoprolites are pierced by ten longitudinal canals with crescent‐shaped outlines in cross‐section, arranged in two symmetrical groups. The symmetry plan and number of canals of the microcoprolites identify the Humptulips ichnospecies as Palaxius habanensisBrönnimann & Norton. The occurrence of decapod fossils along with microcoprolites suggests that callianassid shrimp were the producers of the Palaxius, supporting earlier work that attributed this ichnogenus to callianassids.

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How to cite

APA:

Senowbari-Daryan, B. (2007). The crustacean ichnofossil Palaxius associated with callianassid body fossils in an Eocene methane-seep limestone, Humptulips Formation, Olympic Peninsula, Washington. Lethaia, 40(3), 273-280. https://dx.doi.org/10.1111/j.1502-3931.2007.00026.x

MLA:

Senowbari-Daryan, Baba. "The crustacean ichnofossil Palaxius associated with callianassid body fossils in an Eocene methane-seep limestone, Humptulips Formation, Olympic Peninsula, Washington." Lethaia 40.3 (2007): 273-280.

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