Results 1 to 10 of about 64,869 (244)

Geochemical Characteristics and Oil-Gas Geological Significance of the Cambrian Bituminous Calcite Veins in the Northeast Margin of Ordos Basin, China. [PDF]

ACS Omega
Chen W, Wang X, Liu W, Zhang D, Luo H, Li X, Yuan X.   +6 more
europepmc   +1 more source

Biogeography of Ordovician Chitinozoa

, 1991
openaire   +1 more source

Reconstruction of Provenance and Paleo-Sedimentary Environment of the Saihan Formation in the Manglai Uranium Deposit, Central-Eastern Erlian Basin, China. [PDF]

ACS Omega
Zheng Y, Duan J, Lü Y, Huang Q, Chen N, Li M, Song Z, Guan B, Liao Y, Fan P, Lu J.   +10 more
europepmc   +1 more source

Highly resolved taphonomic variations within the Early Ordovician Fezouata Biota. [PDF]

Sci Rep
Saleh F, Antcliffe JB, Birolini E, Candela Y, Corthésy N, Daley AC, Dupichaud C, Gibert C, Guenser P, Laibl L, Lefebvre B, Michel S, Potin GJ.   +12 more
europepmc   +1 more source

The Ordovician period [PDF]

Geological Society, London, Special Publications, 1964
Summary Stratigraphical and palaeontological evidence for the location of the boundaries of the Ordovician System is examined and considered to be less important than historical priority, so that the Tremadoc is excluded from the system.
A. Williams, H. B. Whittington
openaire   +1 more source

A giant Ordovician anomalocaridid

Nature, 2011
Anomalocaridids, giant lightly sclerotized invertebrate predators, occur in a number of exceptionally preserved early and middle Cambrian (542-501 million years ago) biotas and have come to symbolize the unfamiliar morphologies displayed by stem organisms in faunas of the Burgess Shale type.
Derek E. G. Briggs, Derek E. G. Briggs, Peter Van Roy   +2 more
openaire   +2 more sources

An Ordovician Ceratiocaris [PDF]

American Midland Naturalist, 1945
In 1936 Bradford Willard and the late Professor Freeman Ward collected graptolites from a dump at the Hess slate quarry number 22, at Lynnport, Lehigh County, Pennsylvania (1). The material was submitted to Dr. Rudolf Ruedemann for identification. Dr. Ruedemann noted certain arthropods among the graptolites and kindly consented to study the specimens ...
openaire   +1 more source