Middle Devonian fishes from the Lemhi Range of Idaho
By: [by] Robert H. Denison --
Series: Fieldiana -- v. 16, no. 10; Field Museum of Natural History. [Publication] no. 1062; Publication (Field Museum of Natural History) -- 1062.
Publisher: Field Museum of Natural History
Published: 1968
Place of publication: [Chicago]
Language: eng
Number of pages: 288
Subjects: Fishes, Fossil -- Idaho -- Lemhi Range.; Paleontology -- Devonian.; Paleontology -- Idaho -- Lemhi Range.
Other titles: Devonian fishes from Idaho
Description: The basal unit of the Jefferson formation at the head of Spring Mountain Canyon, Lemhi County, Idaho contains the following fishes: a heterostracan, Psephaspis idahoensis n.sp., which is shown to belong to the Pteraspididae rather than the Drepanaspididae; the arthrodire, Holonema haiti n.sp., and undetermined arthrodires; an antiarch referred to the Astrolepididae indet.; and a spine possibly belonging to a holcephalian. The age is considered to be Middle Devonian, and the depositional environment possibly estuarine.