Word: gabbro
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Every few pages, McPhee takes out his English major's rock hammer and prizes out a sample of whizbang geology lingo: plutons, grabens, horsts, gabbro, incompetent rock, punk rock, catsteps. Slickensides, if you please. Too much gong banging would become grandiose noise, however, and too much info simply another second-year geology text. McPhee, who is beguiled by his geologists and can make you see why, has a good feel for when to ease off into anecdotes. He goes after the rock wonks with butterfly net and magnifying glass...
...history of the moon is revealed by the different types of rock found there. Most of the rocks brought back from the lunar seas by Apollo 11 and 12 are titanium-rich basalt and gabbro. They appear to be once-molten lava from inside the moon which broke through the crust made of lighter anorthosite and crystallized to form the seas about 3.5 billion years...
...Geological Conference. The Mineralogical Determination of a Sand." Mr. J. M. Longyear, Jr. "The Glamorgan Gabbro Ares. Ontario," Mr. W. G. Foye. Mineralogical Lecture Room. University Museum...
...Geological Conference. The Mineralogical Determination of a Sand," Mr. J. M. Longyear, Jr. "The Glamorgan Gabbro Area, Ontario," Mr. W. G. Foye. Mineralogical Lecture Room, University Museum...
...Salem Neck the excursion will visit the outcrops of Essexite, a petrographic type of great importance, which is here cut by younger masses of angite and elaeolite syenite. These 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...