Recent evidence quite convincingly indicates that the Late Permian biotic crisis was in fact a binary extinction with a distinct end-Guadalupian extinction pulse preceding the major terminal end-Permian Tartarian event by 5 million years. In addition anoxia appears to be closely associated with each of these end-Paleozoic binary extinctions. Most leading models cannot explain both anoxia and th...

Palynology is an important tool for establishing age and interpreting paleoenvironments in both continental marine deposits. This paper provides a summarized overview of the palynological information published deposits Colombia ranging from Paleozoic to Miocene-Pliocene. We found 111 publications indexed journals contain data 511 sections or wells. has been mainly studied Eastern Llanos; Triass...

Many of the late Paleozoic granitoid plutons of the southern Appalachians are composite bodies with coarsegrained amphibole + biotite and biotite varietal facies (Speer et al., 1980). From field relations, these facies appear closely related, and multiple intrusion or differentiation comes to mind as an explanation for the relationship. In the Liberty Hill pluton, the coarse-grained central amp...

Tellidorella (type species: T. cristulata) is a small eastern Pacific bivalve presently classified in the Cardiniidae, a family otherwise known as fossils from the Paleozoic and early Mesozoic. Evidence from shell characters including external sculpture, hinge teeth, and adductor muscle scars suggests a more appropriate placement in the subfamily Myrteinae of Lucinidae. This is the first record...

The Sheep Creek camp straddles the eastern boundary o' the Kootenay arc. This arcuate belt of deformed and meta morphosed rocks has had a complex history of Mesozoic ant1 Paleocene compressional and transpressional defo!nnatiol~ overprinted by Eocene extensional tectonics. The rocks an: believed to represent both a distal continental margin and part of a late Paleozoic to early Mesozoic back-ar...