clastic mineral
21calcite — calcitic /kal sit ik/, adj. /kal suyt/, n. one of the commonest minerals, calcium carbonate, CaCO3, found in a great variety of crystalline forms: a major constituent of limestone, marble, and chalk; calc spar. [1840 50; CALC + ITE1] * * * Most… …
22Precambrian time — Interval of geologic time from с 3. 8 billion years ago, the age of the oldest known rocks, to 544 million years ago, the beginning of the Cambrian Period. This interval represents more than 80% of the geologic record and thus provides important… …
23Sedimentology — encompasses the study of modern sediments such as sand [ Raymond Siever, Sand, Scientific American Library, New York (1988), ISBN 0 7167 5021 X.] , mud (silt), [ P.E. Potter, J.B. Maynard, and P.J. Depetris, Mud and Mudstones: Introduction and… …
24Bend Arch-Fort Worth Basin — Infobox Oil field name = Bend Arch Fort Worth Basin Province region = North Central Texas country = United States coordinates = locblock = offonshore = Onshore operators = Devon Energy, Chesapeake Energy, EOG Resources, XTO Energy, EnCana, Range …
25Triassic Period — Interval of geologic time, с 248–206 million years ago, that marks the beginning of the Mesozoic Era. Many new vertebrates emerged during the Triassic, heralding the major changes that were to occur in both terrestrial and marine life forms… …
26Fossil collecting — Collecting fossilized shark s teeth is an easy way to begin collecting fossils. They are often found in abundance on public beaches. The teeth shown here were collected in Castle Hayne, North Carolina, and are from the Eocene and Cretaceous …
27Limestone — For other uses, see Limestone (disambiguation). Limestone Sedimentary Rock Limestone in Waitomo District, New Zealand Composition …
28Rock cycle — rocks do not remain in equilibrium and are forced to change as they encounter new environments. The rock cycle is an illustration that explains how the 3 rock types are related to each other and how processes change from one type to another over… …
29lake — lake1 /layk/, n. 1. a body of fresh or salt water of considerable size, surrounded by land. 2. any similar body or pool of other liquid, as oil. 3. (go) jump in the lake, (used as an exclamation of dismissal or impatience.) [bef. 1000; ME lak(e) …
30Lake — /layk/, n. Simon, 1866 1945, U.S. engineer and naval architect. * * * I Relatively large body of slow moving or standing water that occupies an inland basin. Lakes are most abundant in high northern latitudes and in mountain regions, particularly …
