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Isotopic temperatures and 230 Th/ 234 U ages have been determined for a stalagmite from Cold Water Cave, Iowa, some 50 km west of the Driftless Area. Calcite is now being deposited in this cave under… (More)
Isocrinus wyomingensis from the Jurassic of Wyoming is illustrated and described. The articulation of plates and bifurcations of rays are studied in detail, along with the structure of the stem. The… (More)