10 k.y. depositional cyclicity in the early Eocene: Stratigraphic and 40Ar/39Ar evidence from the lacustrine Green River Formation

J. T. Pietras, A. R. Carroll, B. S. Singer, M. E. Smith

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

40Ar/39Ar dating of sanidine from two interbedded tuffs reveals that the maximum average duration of depositional cycles in the Wilkins Peak Member, Green River Formation, was ∼10 k.y., marking the first time that subprecessional cycles have been recognized in lacustrine strata. The origin of these cycles is uncertain, but may relate to a nonlinear climatic response to orbital forcing of insolation. Alternatively, regional tectonic and geomorphic controls on drainage stability may have promoted autocyclic delivery of sediment to the lake. Owing to an interaction between basin-floor relief and varying amplitudes of lake expansion, only one-third of the cycles identified near the basin center are present near the basin margin. This spatial variability in the temporal completeness of the stratigraphic record is not apparent from examination of individual localities, indicating that studies based on time-series analysis from other lacustrine systems may need reevaluation.

Original languageEnglish (US)
Pages (from-to)593-596
Number of pages4
JournalGeology
Volume31
Issue number7
DOIs
StatePublished - Jul 2003
Externally publishedYes

Keywords

  • Cyclicity
  • Eocene
  • Green River Formation
  • Lacustrine

ASJC Scopus subject areas

  • Geology

Fingerprint

Dive into the research topics of '10 k.y. depositional cyclicity in the early Eocene: Stratigraphic and 40Ar/39Ar evidence from the lacustrine Green River Formation'. Together they form a unique fingerprint.

Cite this