Vol. 261, Issue 9, 1963

Principles of fluid mechanics are used to interpret the structures in high-grade metamorphic rocks which behaved like viscous fluids and thus were deformed by nonuniform laminar flow. The structures investigated...

Detailed geologic mapping of the Sequatchie Valley fault, Sequatchie Valley, Tennessee, has indicated that the Sequatchie Valley fault dips to the SE. at a low angle in the northern part...

Contact metasomatism of Precambrian quartzitic rock bordering a body of hornblende-biotite diorite in the Yellowjacket district, Lemhi County, Idaho, has transformed the quartzite into an igneous-like rock. Fluids enriched in...

A series of essentially time-equivalent shales and sandstones from the Middle Devonian Hamilton Group in New York State was traced and collected from those rocks representing the offshore marine environment...

Deglaciation and postglacial crustal rebound near Portland, Maine, took place during a time of generally rising sea level. The relative positions of land and sea level at several points in...

The types of deposits distinguished are those of active glaciers, now represented by uplifted marine sediments, ground moraine, and terminal moraine, and those of stagnant glaciers, now represented by fluvioglacial...

Fossils of Pediastrum, an alga that today lives exclusively in freshwater, occur in marine sediments in Pakistan (lower Cretaceous) and California (upper Cretaceous). Therefore, fossil Pediastrum does not (as has...

The authors hold an opinion differing from that shown on the Centennial Geologic Map of Vermont in regard to the nature of the contact between the Ordovician carbonates of the...