Glauconite Composition and Morphology, Shocked Quartz, and the Origin of the Cretaceous(?) Main Fossiliferous Layer (MFL) in Southern New Jersey, U.S.A.

The modern walrus, Odobenus rosmarus, is specialized and only extant member of the family Odobenidae. They were much more diversified in the past, and at least 16 genera and 20 species of fossil walruses have been known. Although their diversity increased in the late Miocene and Pliocene (around 8–2 Million years ago), older records are poorly known. A new genus and species of archaic odobenid, Archaeodobenus akamatsui, gen. et sp. nov. from the late Miocene (ca. 10.0–9.5 Ma) top of the Ichibangawa Formation, Hokkaido, northern Japan, suggests rapid diversification of basal Miocene walruses. Archaeodobenus akamatsui is the contemporaneous Pseudotaria muramotoi from the same formation, but they are distinguishable from each other in size and shape of the occipital condyle, foramen magnum and mastoid process of the cranium, and other postcranial features. Based on our phylogenetic analysis, A. akamatsui might have split from P. muramotoi at the late Miocene in the western North Pacific. This rapid diversification of the archaic odobenids occurred with a combination of marine regression and transgression, which provided geological isolation among the common ancestors of extinct odobenids.

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“…muramotoi were found. An association between glauconite and sea-level transgression has been previously reported [ 22 , 23 ].…”

Section: Discussionmentioning

confidence: 90%

A New Late Miocene Odobenid (Mammalia: Carnivora) from Hokkaido, Japan Suggests Rapid Diversification of Basal Miocene Odobenids

Tanaka

Kohno

2015

PLoS ONE

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“…Authochthonous glauconite grains are produced during late transgressive sea level stage (mainly during mfs formation; Amorosi et al, 2011). Also Obasi et al (2011) discussing glauconite formation across the K/T boundary stated that its concentration and maturity is correlable with sea level rise and with decreasing sedimentary rate.…”

Section: "Urgonian" Carbonate Platformmentioning

confidence: 99%

Early Cretaceous sedimentary evolution of a pelagic basin margin (the Manín Unit, central Western Carpathians, Slovakia)

Michalı́k

Lintnerová

Reháková

et al. 2012

Cretaceous Research

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“…5A) which is indicating disconformity during late of Cretaceous [44]. The subzone is characterized by less porosity development and lack of net hydrocarbon column.…”

Section: A Petrophysic and Petrographic Characteristicsmentioning

confidence: 97%

Carbonate Tight Zones Detection and Their Impacts on Bangestan Reservoir Quality, Ahvaz Oil Field, SW Iran

Soleimani¹,

Soleimani²,

Alizadeh³

et al. 2017

IJERMT

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Glauconite Composition and Morphology, Shocked Quartz, and the Origin of the Cretaceous(?) Main Fossiliferous Layer (MFL) in Southern New Jersey, U.S.A.

Cited by 23 publications

References 62 publications

A New Late Miocene Odobenid (Mammalia: Carnivora) from Hokkaido, Japan Suggests Rapid Diversification of Basal Miocene Odobenids

A New Late Miocene Odobenid (Mammalia: Carnivora) from Hokkaido, Japan Suggests Rapid Diversification of Basal Miocene Odobenids

Early Cretaceous sedimentary evolution of a pelagic basin margin (the Manín Unit, central Western Carpathians, Slovakia)

Carbonate Tight Zones Detection and Their Impacts on Bangestan Reservoir Quality, Ahvaz Oil Field, SW Iran

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