Palynostratigraphy of the Tullock Member (lower Paleocene) of the Fort Union Formation in the Powder River basin, Montana and Wyoming

Nichols, Douglas J.; Brown, Janet L.

doi:10.3133/b1917f

1992

DOI: 10.3133/b1917f

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Palynostratigraphy of the Tullock Member (lower Paleocene) of the Fort Union Formation in the Powder River basin, Montana and Wyoming

Douglas J. Nichols¹,

Janet L. Brown²

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Cited by 4 publications

References 19 publications

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Neotypes for Paleocene Species in the Momipites-Caryapollenites Pollen Lineage

Nichols

Ott²

2006

Palynology

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Neotypes are designated herein for certain Paleocene species of juglandaceous pollen that were originally described in 1978. The microscope slides bearing the holotypes have been lost, eliminating the possibility of designating lectotypes and necessitating, instead, the designation of neotype specimens to stabilize the nomenclature of the species, which are biostratigraphically significant. The species for which neotypes are designated are Momipites

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Neotypes for Paleocene Species in the Momipites-Caryapollenites Pollen Lineage

Nichols

Ott²

2006

Palynology

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Magnetostratigraphy of the Lebo and Tongue River Members of the Fort Union Formation (Paleocene) in the northeastern Powder River Basin, Montana

Peppe¹,

Johnson²,

Evans³

2011

American Journal of Science

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We analyzed paleomagnetic samples and documented the stratigraphy from two sections near Miles City, Montana to determine the geomagnetic polarity stratigraphy and to constrain the age and duration of the Lebo and Tongue River Members of the Fort Union Formation in the northeastern Powder River Basin. The resulting polarity sequence can be correlated to subchrons C29n-C26r of the geomagnetic polarity time scale. By interpolating measured sediment accumulation rates from the base of C28r to the top of C27n, and then extrapolating to the top of the Tongue River Member and the bottom of the Lebo Member, we developed two age models to estimate the durations of the Lebo and Tongue River Members. Based on the first model, which uses different sedimentation rates for the Lebo and Tongue River Members, we estimate the duration of deposition of the Lebo to be between 1.30 and 1.74 million years and of the Tongue River to be between 1.42 and 1.61 million years. Using the second model, which uses the same sedimentation rate for the Lebo and Tongue River Members, we estimate the duration of deposition of the Lebo to be between 1.33 and 1.76 million years and of the Tongue River to be between 1.00 and 1.25 million years. Our results indicate a decrease in sediment accumulation rates in C27r, which is likely the result of a 0.26 to 0.62 million-year long depositional hiatus in the middle of C27r, represented by the Lebo-Tongue River contact. This unconformity occurs ϳ2 million years earlier than previously suggested and is likely contemporaneous with unconformities in the Williston Basin and in southwestern Alberta, suggesting that it may be regionally significant.

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Palynology and depositional history of the Paleocene? Thyra Ø Formation, Wandel Sea Basin, eastern North Greenland

Lyck

Stemmerik

2000

ggub

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NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Lyck, J. M., & Stemmerik, L. (2000). Palynology and depositional history of the Paleocene? Thyra Ø Formation, Wandel Sea Basin, eastern North Greenland. Geology of Greenland Survey Bulletin, 187, 21-49. https://doi.org/10.34194/ggub.v187.5193 _______________ The Thyra Ø Formation in eastern North Greenland has been dated as Late Paleocene to possibly earliest Eocene based on its content of palynomorphs. The palynomorph assemblage is dominated by long ranging taxa and reworked Upper Cretaceous species. The Late Paleocene age of the formation is based on the occurrence of Cerodinium speciosum and Spinidinium pilatum. However, the presence of Cerodinium markovae, Spinidinium sagittula, and ?Ilexpollenites sp. suggests that the formation may range into the earliest Eocene.

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Palynostratigraphy of the Tullock Member (lower Paleocene) of the Fort Union Formation in the Powder River basin, Montana and Wyoming

Cited by 4 publications

References 19 publications

Neotypes for Paleocene Species in the Momipites-Caryapollenites Pollen Lineage

Neotypes for Paleocene Species in the Momipites-Caryapollenites Pollen Lineage

Magnetostratigraphy of the Lebo and Tongue River Members of the Fort Union Formation (Paleocene) in the northeastern Powder River Basin, Montana

Palynology and depositional history of the Paleocene? Thyra Ø Formation, Wandel Sea Basin, eastern North Greenland

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