Word: quartz
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Dates: during 1890-1899
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...Professor Emerson, of Amherst College. Leaving the Boston and Albany station at 7.15 p. m., the party will spend the night at the "Norwood" in Northampton. the first thing visited on Saturday will be the fossil fish beds at the foot of Mt. To by and the outcrop of quartz schist and amphibolite, these being "buried peaks," which the glacial scouring has revealed below the Triassic conglomerate. Fragments of these rocks may be traced in the conglomerate for miles southward. This is in the centre of the interesting Triassic or New Red Sandstone region, the source of the "fossil foot...
Geological Conference. Paper: The Function and Systematic Importance of the Aptychus in Ammonites. Dr. C. R. Eastman.- The Quartz Porphyry of Mt. Pequawket. Mr. R. A. Daly. Geological Laboratory, Room...
Geological Conference. Paper: The Function and Systematic Importance of the Aptychus in Ammonites. Dr. C. R. Eastman.- The Quartz Porphyry of Mt. Pequawket. Mr. R. A. Daly. Geological Laboratory, Room...
...rocks are traversed by a series of gabbro dikes and by a still younger series of tinguaites which cut all the older formations. Thence proceeding to Marblehead Neck, granite will be seen intrusive through the Cambrian rocks, the keratophyre sheet overlaying the old rhyolites, and finally the more recent quartz porphyry dikes...