...J. Kalvoda; J. Nudds; O. Bábek; C. Howells Abstract The study of the foraminiferal fauna in the Ogmore section in south Wales produced a detailed late Chadian–early Arundian biostratigraphy and sequence stratigraphy with a higher resolution than in the Arundian stratotype in Hobbyhorse Bay...

...J. W. Tilsley; D. Korn SUMMARY Ammonoids from the Chadian Waulsortian mud-mounds of the Peak District (Derbyshire and Staffordshire) have been examined utilizing new collections and additional museum material. The genera Fascipericyclus , Ammonellipsites , Helicocyclus , Dzhaprakoceras...

...Liu Tiebing; Fan Delian; Ye Jie Abstract The Chadian phosphorus-manganese deposit occurs in the late Sinian Doushantuo Formation. The orebearing sequence consists of black phyllite, a phosphorite ore sequence, a manganese ore sequence, and dolostone. Phosphorite ores are divided into four types...

... the Ivorian-Chadian boundary. This nonmonotonic variation has not been recognized by previous studies. Furthermore, marine cements yielded 87 Sr/ 86 Sr ratios lower than previously reported values for the Ivorian-Chadian (Osagean). Marine fibrous cements are interpreted to be compositionally unaltered...

...Fig. 2. Map of the ‘Chadian’–lower Arundian outcrop in south Cumbria showing the outcrops of the Martin Limestone and Red Hill Limestone formations, with location in Britain marked on inset map in red. Based on Digimap data. Geological Map Data BGS © UKRI 2024. ...

... . The evolutionnary degree is compatible with an age around the Mio-Pliocene boundary (ca 5 Ma). Then, the Chadian remains are the oldest adequately dated record of this family in Africa. They are contemporaneous with the oldest known evidence of the genus Paracamelus from the late Miocene of Asia and Europe...

... only be assigned at the generic level. Hastarian (Times 1 and 2) faunas have a very low generic richness with only one genus known. Ivorian (Time 3) faunas have a substantially higher generic richness with 21 genera known. Chadian faunas have the highest generic richness with 28 genera from the lower...

... this area only occur as a jumble of plates. Melonechinus etheridgei (Keeping) (Chadian? to Brigantian?) has thick test plates; interambulacral plates are commonly hexagonal; ambulacra include multiple columns of pore pairs; and plate surfaces bear many small secondary tubercles. Archaeocidaris sp. or spp...

...D. WILSON; J. R. DAVIES; M. SMITH; R. A. WATERS Abstract Marked thickness changes in early Dinantian (Courceyan-Chadian) sediments occur across the Cardiff-Cowbridge Anticline, a major east-west Variscan fold in the Vale of Glamorgan. They resulted from differential subsidence over an active...

... shallow water marine limestones and fine-grained terrigenous clastic sedimentary rocks. These sediments were rapidly deposited and there was little bathymetric variation across the basin. During Chadian times (Clitheroe Limestone Formation), the effects of basement rifting became more pronounced...