Twenty-two ammonite species are identified in the upper Albian Mortoniceras ( Subschloenbachia ) rostratum , perinflatum and Stoliczkaia Shumarinaia africana Zones, lower Cenomanian Mantelliceras mantelli Zone. The Placenticeras Saadensis Thomas (Thomas Peron, 1890, 1890 is revised, including Engonoceras Thomasi Pervinquière, 1907, placed within genus Hypengonoceras Spath, 1922. This accurate b...

A sample of six probable fragmentary ankylosaur ossicles, collected from Cenomanian deposits of the Dunvegan Formation along the Peace River, represent one of the first dinosaurian skeletal fossils reported from pre-Santonian deposits in Alberta. Specimens were identified as ankylosaur by means of a palaeohistological analysis. The primary tissue is composed of zonal interwoven structural fibre...

Six localities in the mid-Cretaceous (early Cenomanian) Khodzhakul Formation, western Kyzylkum Desert, Uzbekistan, produced mammalian remains of a possible zalambdalestoid (Bobolestes), a possible zalambdalestid, and two (Sheikhdzheilia rezvyii, gen. et sp. nov. and Eozhelestes mangit) or three zhelestids (‘‘Zhelestidae’’ indet., unnamed large sp. A). This is termed the Sheikhdzheili local faun...

Based on a review of troodontid specimens from the territories of the former Soviet Union, including new discoveries from Uzbekistan, two dental morphotypes can be distinguished among Troodontidae from the Cretaceous of Asia: (1) unserrated teeth, present in Mei from Lujiatun (China; Early Cretaceous: Hauterivian-Barremian), an unnamed taxon from Hövöör (Mongolia; Early Cretaceous: Aptian-Albia...

Diatoms are one of the most important eukaryotic primary producers in lower ecosystem; understanding their evolutionary history is therefore also important. Throughout Cenozoic hydrosphere, diatoms have flourished. However, as a result progressive diagenesis and dissolution opaline silica that forms frustules, early evolution during Cretaceous unclear, so fossil record incomplete. Largely becau...

BACKGROUND Ichthyosaurs are reptiles that inhabited the marine realm during most of the Mesozoic. Their Cretaceous representatives have traditionally been considered as the last survivors of a group declining since the Jurassic. Recently, however, an unexpected diversity has been described in Upper Jurassic-Lower Cretaceous deposits, but is widely spread across time and space, giving small clue...