Establishes relative position of sedimentary rock.

S.M.L Pohler has written:

'Ordovician conodont biostratigraphy, western Canadian cordillera'

Wentang. Zhang has written:

'Biostratigraphy of China'

'Zhongguo di ao tao xi'

Nelly Hooper Ludbrook has written:

'Cretaceous biostratigraphy of the Great Artesian Basin in South Australia' -- subject(s): Paleontology

'Scaphopoda'

Liisa Ikonen has written:

'Biostratigraphy of the Mikulino interglacial sediments in NW Russia' -- subject(s): Micropaleontology, Paleontology, Palynology, Stratigraphic Paleontology