Well-preserved holdfasts and early growth stages of the tubular cnidarian Sphenothallus are described from Silurian (Llandovery Series) Washington Land, North Greenland. The diameter holdfast is determined by formation a basal disc attached to substrate, upon which initially conical, but subsequently shell formed. characteristic opposing longitudinal thickenings developed at each angular margin...

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...

Despite growing attention on the influence of functional diversity changes on ecosystem functioning, a palaeoecological perspective on the long-term dynamic of functional diversity, including mass extinction crises, is still lacking. Here, using a novel multidimensional functional framework and comprehensive null-models, we compare the functional structure of Cambrian, Silurian and modern benth...

Cladistic parsimony analysis of the subfamily Deiphoninae Raymond, 1913 was conducted to produce a hypothesis of relationship for the group. The genera Deiphon Barrande, 1850 and Onycopyge Woodward, 1880 are found to be monophyletic, while the genus Sphaerocoryphe Angelin, 1854, as it was previously defined, is paraphyletic. A modified Brooks Parsimony Analysis using the phylogenetic hypothesis...

The Paleo-Asian Ocean controlled the tectonic evolution of Northeast Asia and formed Karamaili Orogenic Belt in eastern Junggar basin. However, chronological constrain paleo-Karamaili remains unclear. In this study, we focused on sandstones Lower Jurassic Badaowan Sangonghe Formations Dongdaohaizi Depression, basin near orogenic belt. After detailed observations descriptions macroscopic feature...

ABSTRACT Throughout the history of life on Earth, sedimentary environments have placed controls trajectory evolutionary innovations. To survive and thrive in newly colonized environments, organisms needed to develop novel behaviors: often evidenced rock record as architectural innovation diversification trace fossil morphology. This study focuses ichnological a response challenges presented by ...