Paleosol-based inference of niches for Oligocene and early miocene fossils from the John Day Formation of Oregon

Retallack, Gregory J.; Samuels, Joshua X.

doi:10.1080/02724634.2019.1761823

Cited by 2 publications

(1 citation statement)

References 94 publications

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“…Merychyus calaminthus of the late Arikareean Tick Canyon Formation, California (Jahns, 1940), was reported from the Harrison Formation (Ar3 or Ar4) of western Nebraska (Lander and Lindsay, 2011). Retallack and Samuels (2020) recognized overlapping Entoptychus individens and Merychyus arenarum zones in the Haystack–Balm Creek members of the John Day Formation (late Ar3). The first appearance datum for Cynorca sociale is in the Haystack Member (Ar3) of the John Day Formation, but it is also known from the early to late Hemingfordian of Texas and California (Woodburne, 1969; Albright et al, 2008).…”

Section: Stratigraphic Setting and Age Of The Mulholland And Warm Spr...mentioning

confidence: 99%

Two Asian cricetodontine-like muroid rodents from the Neogene of western North America

2023

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We appraise the morphology and potential origin of two Neogene cricetodontine-like muroids, Pliotomodon primitivus from Late Miocene sediments in northern California and an undescribed muroid from the late Oligocene or Early Miocene of central Oregon. Superficial resemblance of the dentition of Pliotomodon with members of the North American galushamyinan neotominins is considered a result of parallel evolution, as shown by the large size and unreduced M3/m3 of the former. Dental features of Pliotomodon are similar to those of Eurasian genera such as Byzantinia, Hispanomys, and Ruscinomys, but the unusual morphology of M3/m3, with continuous enamel connections across their lingual surfaces closing the hypoflexus and posteroflexid, respectively, plus retention of only three roots on M1, suggests Pliotomodon arose from an ancestor distinct from the one that gave rise to the large late Neogene hypsodont cricetodontines of the Old World. In the absence of known ancestral taxa in North America, we postulate Pliotomodon dispersed to North America across Beringia during the Hemphillian (ca. 8.6 Ma, Hh-1). Another archaic cricetodontine-like rodent, from the Warm Springs region of the John Day Formation in Oregon, is named as a new species of Deperetomys, D. dingusi new species. Deperetomys dingusi n. sp. likely descended from a species of Deperetomys intermediate between archaic species such as D. calefactus and D. magnus and more dentally derived species such as D. intermedius and D. hagni, dispersing to North America during the late Oligocene or Early Miocene (Arikareean; ca. 23 Ma, Ar3 or Ar4). UUID: http://zoobank.org/b691db3a-79de-4d3e-8af0-3bda4957b119

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Section: Stratigraphic Setting and Age Of The Mulholland And Warm Spr...mentioning

confidence: 99%

Two Asian cricetodontine-like muroid rodents from the Neogene of western North America

2023

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Paleoclimate instabilities during late Oligocene - Early Miocene in SW Europe from new geochemical climofunctions based on soils with pedogenic carbonate

Gillot

Cojan

Badía

2022

Palaeogeography, Palaeoclimatology, Palaeoecology

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Paleosol-based inference of niches for Oligocene and early miocene fossils from the John Day Formation of Oregon

Cited by 2 publications

References 94 publications

Two Asian cricetodontine-like muroid rodents from the Neogene of western North America

Two Asian cricetodontine-like muroid rodents from the Neogene of western North America

Paleoclimate instabilities during late Oligocene - Early Miocene in SW Europe from new geochemical climofunctions based on soils with pedogenic carbonate

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