Late Cambrian to early Ordovician trilobites, the family Olenidae, were tolerant of oxygen-poor, sulfur-rich sea floor conditions, and a case is made that they were chemoautotrophic symbionts. Olenids were uniquely adapted to this habitat in the Lower Paleozoic, which was widespread in the Late Cambrian over Scandinavia. This life habit explains distinctive aspects of olenid morphology: wide th...

A large data base consisting of 40,679 well locations and 196,687 lithologic records was created from Illinois, Indiana, and Wisconsin well construction records for wells drilled during the period 1980-1997. The purpose of the database is to provide information for mapping the surface, thickness, transmissivity and hydraulic conductivity of the Quaternary, Silurian/Devonian, and Cambrian/Ordovi...

The generic name Iliella was proposed by Rukavischnikova (Nikitin & al., 1980: 71; type species I. minima Rukavischnikova, by original designation) for a new fossil brachiopod genus from the Upper Ordovician (Katian: Chokparian horizon) of the north of Dulankara mountains (Southern Kazakhstan, Central Asia). However, this name is already preoccupied by a fossil branchiopod generic name Iliella ...