The puzzle assembled: Ediacaran guide fossil Cloudina reveals an old proto-Gondwana seaway
L.V. Warren et al., Departamento de Geologia Aplicada, Instituto de Geocincias e Cincias Exatas, Universidade Estadual Paulista, Avenida 24A, 1515, Rio Claro 13506-900, Brazil. Published online 17 Mar. 2014, http://dx.doi.org/10.1130/G35304.1.
During the Ediacaran period, the Clymene ocean separated the Laurentia to the northeast, Amazonia and Ro Apa cratons to the southeast, and several landmasses to the west, forming the Proto-Gondwana supercontinent. However, no clear evidence about the existence of Ediacaran epeiric seas over those landmasses has been found so far. In this paper, L.V. Warren and colleagues report and discuss the discovery of the Ediacaran guide fossil Cloudina sp. associated with other metazoan body and trace fossils in the Bambu Group (central-eastern Brazil). This new finding helps to solve an old geologic puzzle of the Gondwana supercontinent -- the depositional age of the Bambu Group. The paleogeographic position of Cloudina-bearing successions in Brazil, Antarctica, Namibia, and Argentina suggest a new scenario of ocean connectivity among coeval intracratonic basins of South America, Africa, and Antarctica at the end of Neoproterozoic.
Large subduction earthquakes along the fossil Moho in Alpine Corsica
T.B. Andersen et al., Centre of Earth Evolution and Dynamics, Department of Geosciences, University of Oslo, P.O. Box 1047, Blindern 0316 Oslo, Norway. Published online 17 Mar. 2014, http://dx.doi.org/10.1130/G35345.1.
This paper reports the discovery of rocks formed by large earthquakes along the crust-mantle boundary (moho) in an an
|Contact: Kea Giles|
Geological Society of America