Word: precambrian
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...rock structure convinced them that the site would make an ideal superbunker. An April 1953 bureau study concluded that "the rock in the area . . . is exceptionally hard and tight." There were few faults or fissures; most of the rock was epidosite and greenstone, a local name for a Precambrian basalt that had metamorphosed into an extremely dense formation...
...northern Canada along the eastern seaboard and then dips out of sight in southwestern Texas. This geologic connection, combined with some data from the magnetic orientation of ancient rocks, suggests that Antarctica, as well as Australia, was shoved up against the western coast of North America late in the Precambrian period (from 1 billion to 570 million years ago) as part of the original supercontinent, said Dalziel...
...found in the Canadian Arctic last summer [Nov. 12] now reports that on rechecking it has found a computational error and that the minimum age of the fossils is 445 million years. But the structural geologic relations indicate that this age is impossibly young: the fossils are almost surely preCambrian. Other tests by different methods are being undertaken. I hope they will resolve the uncertainty about the dates...
...region in the southern Adirondack is one of the most famous geological study grounds in the country. Here the summer student may study easily early Paleozoic sediments overlapping the Precambrian complex as he "roughs it" according to the best geological tradition, living in a tent and sleeping in a folding...