biochron


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biochron

[′bī·ō‚krän]
(paleontology)
A fossil of relatively short range of time.
References in periodicals archive ?
Biochron.--Late Pleistocene (Euneomys; see Tammone et al., 2014; Neotomys; see Pardinas and Ortiz, 2001) to Recent.
0.7 Ma) (Maslin and Ridgwell, 2005; Clarck et al., 2006), rather coinciding with the Epivillafranchian biochron (ca.
The ichnological record there fore coincides most parsimoniously with the late Stephanian Dromopus biochron of Lucas (2003).
The LJ3-1 transgressive peak seems to have an age corresponding to the Upper Pliensbachian Margaritatus Biochron in the Basque-Cantabrian Basin, in the Lusitanian Basin and in the Tethyan domain, representing another key interval for correlation purposes.
Analysis of taphonomic gradients and biostratigraphic data indicate that sedimentation in this eastern area was interrupted very early, probably at the Bullatus-Gracilis Chronozone boundary or even during the Bullatus Biochron. Sedimentary and bathymetric conditions were gradually changing from subtidal to shallow intertidal or even supratidal leading to a long period of probable subaerial exposure of the platform in this area, perhaps punctuated by brief periods of very shallow directional currents that would generate the abrasion facets on the ammonite internal moulds.
cretacea Biochron, and became extinct in the early part of the Ps.
pseudobulloides Biochron (e.g., Parvularugoglobigerina longiapertura, Pv.
hantkeninoides Biochron, and remained unchanged through the rest of the section (through the Ps.