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shale
(Encyclopedia) shale, sedimentary rock formed by the consolidation of mud or clay, having the property of splitting into thin layers parallel to its bedding planes. Shale tends to be fissile, i.e.,…slate
(Encyclopedia) slate, fine-grained rock formed when sedimentary rocks such as shale are metamorphosed by great pressure. Slate splits into perfectly cleaved, broad thin layers; this…Triassic period
(Encyclopedia) Triassic periodTriassic periodtrīăsˈĭk [key], first period of the Mesozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table) from 205 to 250 million years…kerosene
(Encyclopedia) kerosene or kerosine, colorless, thin mineral oil whose density is between 0.75 and 0.85 grams per cubic centimeter. A mixture of hydrocarbons, it is commonly obtained in the…Grand Junction
(Encyclopedia) Grand Junction, city (2020 pop. 65,560), seat of Mesa co., W Colo., at the junction of the Gunnison and Colorado rivers; inc. 1891. The…Carboniferous period
(Encyclopedia) Carboniferous periodCarboniferous periodkärbənĭfˈərəs, fifth period of the Paleozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table), from 350 to 290…Eocene epoch
(Encyclopedia) Eocene epochEocene epochēˈəsēnˌ [key], second epoch of the Tertiary period in the Cenozoic era of geologic time, from approximately 54.9 to 38 million years ago. The Eocene in North…Fushun
(Encyclopedia) Fushun Fushun f&oomacr;ˈsh&oomacr;nˈ [key], city, NE Liaoning prov., China, in a highly…Monument Valley
(Encyclopedia) Monument Valley, scenic arid region, c.2,000 sq mi (5,000 sq km), SE Utah and NE Ariz. Located in the Navajo Indian Reservation, Monument Valley is not a true valley but an area of…Autun
(Encyclopedia) Autun Autun ōtöNˈ [key], town, Saône-et-Loire dept., E central France, on the Arroux River. It is an industrial center producing metals, machinery, leather,…Trending
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