Terry Engelder, a leading authority on the recent Marcellus gas shale play, received his B.S. degree from Pennsylvania State University (1968), his M.S. degree from Yale University (1972), and his Ph.D. from Texas A&M University (1973). He is currently a professor of geosciences at Penn State and has previously served on the staff of the U.S. Geological Survey, Texaco, and LamontDoherty Earth O...

A rare psammosteid heterostracan (Agnatha) occurrence in the Devonian of the Prague Basin is indicative of a dry land influence in the regional palaeogeography. This argument is strongly supported by the appearance of vascular plants, but the studied vertebrates allow us to presume a local brackish water environment. These conditions are considered to be related to a supposed land in the vicini...

Abstract. In the Late Devonian to earliest Mississippian, Svalbard was affected by a short-lived episode of deformation named Svalbardian Orogeny. This event resulted in intense folding and thrusting sedimentary successions. Deformation stopped prior deposition Carboniferous Permian strata Billefjorden Gipsdalen groups, which lie unconformably over folded strata. Later on, presumed structures w...

CONTENTS Introduction 85 Brief overview of Cambrian radiation of bilateral animals 86 Rapid diversification of animal phyla 86 Characteristic body plan of each phylum 86 Early establishment of body plan 87 Altered expression of embryonic genes resulting in new body plans 87 Silurian–Devonian radiation of land plants 88 Did early land plants diverge in a rapid evolutionary radiation? 88 Are the ...

The discovery of arbuscules in Aglaophyton major, an Early Devonian land plant, provides unequivocal evidence that mycorrhizae were established >400 million years ago. Nonseptate hyphac and arbuscules occur in a specialized meristematic region of the cortex that continually provided new cells for fungal infection. Arbuscules are morphologically identical to those of living arbuscular mycorrhiza...

The article considers an approach to the reconstruction of bioproductivity Palaeozoic pelagic ecosystems based on numeric modelling carbon isotope fractionation. model uses information dioxide content in atmosphere, water temperature, and isotopic composition carbonates conodont elements. developed is tested material from Upper Devonian — Lower Carboniferous northern Cis-Urals (successions carb...

The Earn Group of central Yukon records the transition from a passive to an active margin along western Laurentia in Late Devonian. Fine-grained clastic rocks and chert lower contain late Early Middle Devonian fossils were deposited offshelf environment. upper comprises mixture sandstone conglomerate, fine-grained siliciclastic rocks, widespread crystal lithic tuff. Zircons this succession are ...