Elgaecrinus uralicus gen. et sp. nov. (Crotalocrinitidae, Crinoidea, Echinodermata), a reef-dwelling crinoid, is described from the Lochkovian (Lower Devonian) of the western slope of the Middle Urals. The arms of the new species are laterally fused in each radius and represent, as in the similar genus Crotalocrinites, uniform semi-mobile plates surrounding the central cavity above the oral sur...

Abstract The timing of assembly and tectonic origins terranes in the northern Cordillera Alaska, British Columbia, Pacific Northwest are debated. Stikinia, a long‐lived arc terrane, has an enigmatic regional Mesozoic accretionary history its remain unconstrained. Zircon U‐Pb geochronology Lu‐Hf isotopic data on Triassic–Jurassic sedimentary igneous rocks from central Stikinia shed light terrane...

Relational reinforcement learning RRL is both a young and an old eld In this pa per we trace the history of the eld to re lated disciplines outline some current work and promising new directions and survey the research issues and opportunities that lie ahead

A new fossil site near Gilboa, New York, is one of only three where fossils of terrestrial arthropods of Devonian age have been found. The new Gilboan fauna is younger than the other two but richer in taxa. Fragmentary remains and nearly whole specimens assigned to Eurypterida, Arachnida (Trigonotarbida, Araneae, Amblypygi, and Acari), Chilopoda [Craterostigmatomorpha(?) and Scuterigeromorpha(?...