4,231
edits
Changes
Jump to navigation
Jump to search
Line 35:
Line 35: − +
Biofacies and changing sea level (view source)
Revision as of 21:12, 25 July 2014
, 21:12, 25 July 2014→Biofacies mixing
==Biofacies mixing==
==Biofacies mixing==
The downslope transport of shallow-water faunas by sediment gravity-flow processes may result in the mixing of biofacies assemblages from different environments.<ref name=ch04r119>Woodbury, H., O., Murray, I., B., Pickford, P., J., Akers, W., H., 1973, [http://archives.datapages.com/data/bulletns/1971-73/data/pg/0057/0012/2400/2428.htm Pliocene and Pleistocene depocenters, outer continental shelf, Louisiana and Texas]: AAPG Bulletin, vol. 57, p. 2428–2439.</ref> The further mixing of stratigraphically separate assemblages by rotary drilling complicates the identification of mixed assemblages. Such problems can be overcome in three ways:
The downslope transport of shallow-water faunas by sediment gravity-flow processes may result in the mixing of [[biofacies assemblages]] from different environments.<ref name=ch04r119>Woodbury, H., O., Murray, I., B., Pickford, P., J., Akers, W., H., 1973, [http://archives.datapages.com/data/bulletns/1971-73/data/pg/0057/0012/2400/2428.htm Pliocene and Pleistocene depocenters, outer continental shelf, Louisiana and Texas]: AAPG Bulletin, vol. 57, p. 2428–2439.</ref> The further mixing of stratigraphically separate assemblages by rotary drilling complicates the identification of mixed assemblages. Such problems can be overcome in three ways:
* Careful sample analysis, specifically looking for mixed assemblages
* Careful sample analysis, specifically looking for mixed assemblages