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Titolo:
INFLUENCE OF TRANSPORTATION AND TIME-AVERAGING IN FOSSIL ASSEMBLAGES FROM THE PENNSYLVANIAN OF OKLAHOMA
Autore:
OLSZEWSKI TD; WEST RR;
Indirizzi:
PENN STATE UNIV,DEPT GEOSCI UNIVERSITY PK PA 16802 KANSAS STATE UNIV,DEPT GEOL MANHATTAN KS 66506
Titolo Testata:
Lethaia
fascicolo: 4, volume: 30, anno: 1997,
pagine: 315 - 329
SICI:
0024-1164(1997)30:4<315:IOTATI>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEATH ASSEMBLAGES; TEXAS BAYS; SHELLS; ENVIRONMENTS; DESTRUCTION; DISSOLUTION; ORDINATION; CARBONATES; TAPHONOMY; SIZE;
Keywords:
PALEOECOLOGY; TAPHONOMY; TIME-AVERAGING; TRANSPORTATION; RELATIVE-ABUNDANCE DATA; PRESENCE/ABSENCE DATA;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
64
Recensione:
Indirizzi per estratti:
Citazione:
T.D. Olszewski e R.R. West, "INFLUENCE OF TRANSPORTATION AND TIME-AVERAGING IN FOSSIL ASSEMBLAGES FROM THE PENNSYLVANIAN OF OKLAHOMA", Lethaia, 30(4), 1997, pp. 315-329

Abstract

The relive effects of shell destruction, transportation, and time-averaging have been assessed in seventeen sofi-bottom, benthic fossil collections from the Pennsylvanian Wewoka Formation in Hughes County, Oklahoma. invertebrates were identified to species level, and each was subject to a taphonomic evaluation to determine whether it was in place. Species that were not deemed parautochthonous (Living at the locationof collection shortly before final burial) were eliminated from the faunal lists to reduce the effects of time-averaging and transportationin the fossil assemblages. Both reciprocal averaging and non-metric multidimensional scaling ordinations revealed two biofacies. These weredistinguished using both presence/absence data and numerical counts of species despite an overwhelming number of taxa occurring in both biofacies. Comparison between ordinations based on entire faunal lists with those based on parautochthonous faunal lists indicates that the true biofacies faithfully reproduce differences in the living distributions of member taxa but that the two biofacies underwent different degrees of time-averaging and transportation. Time-averaging leads to accumulation of taxa over time, thereby making presence/absence compositionof collections more similar. Transportation, on the other hand, homogenizes originally patchy population distributions and makes relative abundances more uniform. Based on differences in abundances and presence/absence patterns, the stratigraphically lower biofacies underwent more transportation and more time-averaging than the upper biofacies.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 17:54:56