the Aptian

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• Aptian extinction — The Aptian extinction was an extinction event of the early Cretaceous Period. It is dated to c. 116 or 117 million years ago, in the middle of the Aptian stage of the geological time scale, and has sometimes been termed the mid Aptian extinction… …   Wikipedia

• Aptian — stage is a faunal stage of the Early Cretaceous epoch in the geologic timescale, that extends from 125.0 ± 1.0 Ma to 112.0 ± 1.0 Ma (million years ago), approximately. The Aptian stage succeeds the Barremian stage and precedes the Albian stage,… …   Wikipedia

• Aptian Stage — ▪ geology       fifth of six main divisions (in ascending order) in the Lower Cretaceous Series, representing rocks deposited worldwide during the Aptian Age, which occurred 125 to 112 million years ago during the Cretaceous Period. Rocks of the… …   Universalium

• aptian — ˈaptēən, psh(ē)ən adjective Usage: usually capitalized Etymology: French aptien, from Apt, commune near Avignon, France + French ien ian : of or relating to a subdivision of the European Lower Cretaceous see geologic time table …   Useful english dictionary

• Geology of the North Sea — Contents 1 Tectonic structure 2 Precambrian 3 Finnmarkian, Athollian, Caledonian Orogenies …   Wikipedia

• Izu-Bonin-Mariana Arc — The Izu Bonin Mariana (IBM) arc system is an outstanding example of a plate tectonic convergent boundary. IBM extends over 2800 km south from near Tokyo, Japan, to beyond Guam, and includes the Izu Islands. Bonin Islands, and Mariana Islands;… …   Wikipedia

• Barremian — The Barremian faunal stage was a period of geological time between 130.0 ± 1.5 mya (million years ago) and 125.0 ± 1.0 mya). It is considered to be of the Early Cretaceous epoch, in which it constituted the earliest part of the obsolete Gallic… …   Wikipedia

• Glen Rose Formation — The Glen Rose Formation, located in the Dinosaur Valley State Park in Glen Rose, Texas, is a fossil bearing bed dating from the Aptian Albian boundary of the early Cretaceous. The Glen Rose Trackway is located at the base of the formation, which… …   Wikipedia

• Xinminbao Group — The Xinminbao Group is a group of geological formations in north central China. They occur across a large depression between the Altai mountains of Mongolia to the north and the Qilian mountains of the Qinghai Plateau to the south, in the… …   Wikipedia

• Cretaceous Period — Interval of geologic time from с 144 to 65 million years ago. During the Cretaceous the climate was warmer than today. In the seas, marine invertebrates flourished, and bony fishes evolved. On land, flowering plants arose, and insects, bees in… …   Universalium

• Species of Psittacosaurus — Seventeen species have been assigned to the extinct ceratopsian dinosaur genus Psittacosaurus , although only nine to eleven are considered valid.Xu Xing Zhao Xijin. (1999). Psittacosaur fossils and their stratigraphical implications. In: Wang Y …   Wikipedia