The Toodoggone-McConnell Project was inititated in 1996 to map and evaluate a tract of Early Jurassic plutons and surrounding arc volcanic successions of Paleozoic to Jurassic age for base and precious metal mineralization. Bedrock mapping during the first year of the program focussed on a region south of the Finlay River and east of Thutade Lake, documenting local geology near known copper-gol...

A well-preserved Uraloporella boundstone has been discovered in the Cuera Limestones lithostratigraphic unit of Carboniferous Asturias (Spain), a level Moscovian age (Podolsky time equivalent). The accompanying microfauna allows us to assign this foraminiferal Zone 25 Mamet, and B subzone Fusulinella van Ginkel. Biometric study thalli indicates that ali previously-proposed specles ( mass&iacute...

Regional geologic mapping in 1994 extended previous 150 000-scale mapping of the Tulsequah River mapsheet (104W12; Mihalynuk et a/.. 1994a, b) eastward into the Stuhini Creek map area (104Wl1, Figure 1). Approximately 20% of the Tulsequah River and 45% of the Stuhini Creek map sheets has been previously mapped as Upper Triassic Stuhini Group (Souther, 1971'). More recently, fossil and is...

The possibility that the Avalon Platform, where the Avalonian lithotectonic belt is best developed, was involved in late Paleozoic displacement was tested by paleomagnetic study of red sandstones of the Upper Devonian Terrenceville Formation of eastern Newfoundland. Two magnetization directions were identified by thermal demagnetization analysis of 60 oriented samples from 10 sites: a high bloc...

The genesis and timing of formation the giant Bayan Obo deposit, world's largest rare earth element (REE) deposit in western part late Paleozoic northern North China continental arc (NCA), are highly controversial due to complex mineral assemblages reported ages mineralization. We conducted new zircon U-Pb 40Ar/39Ar dating metamorphic igneous Neoarchean Permian mid-to upper-crustal rocks exhume...

Cohorts of marine taxa that originated during recoveries from mass extinctions were commonly more widespread spatially than those originating at other times. Coupled with the recognition of a correlation between the geographic ranges and temporal longevities of marine taxa, this observation predicts that recovery taxa were unusually long-lived geologically. We analyzed this possibility by asses...

To geologists, the Ordovician System of Ohio is probably the most famous of the state's Paleozoic rock systems. The alternating shales and limestones of the upper part of this system crop out in southwestern Ohio in the Cincinnati region and yield an incredible abundance and diversity of well-preserved fossils. Representatives of this fauna reside in museums and private collections throughout t...