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21Roller cone bit — A roller cone bit is a drill bit used for drilling through rock, for example when drilling for oil and gas. [cite book | last = Hyne | first = Norman J. | title = Dictionary of Petroleum Exploration, Drilling Production | publisher = PennWell… …
22Neotectonics — is a subdiscipline of tectonics. It is the study of the motions and deformations of the Earth s crust (geological and geomorphological processes) which are current or recent in geologic time.[1] The term may also refer to the motions/deformations …
23Battle of the Novgorodians with the Suzdalians — The Battle of the Novogorodians with the Suzdalians (ru: Битва Новгородцев с Суздацами) is a twelfth century episode in which the city of Novgorod the Great was said to have been miraculously delivered from a besieging army from Suzdalia (the… …
24Marble Falls, Texas — Marble Falls redirects here. For the location in the Ozarks, see Marble Falls, Arkansas. Marble Falls, Texas   City   …
25Edisson Wassiljewitsch Denissow — Denissow (1975) Edisson Wassiljewitsch Denissow (russisch Эдисон Васильевич Денисов, oft auch in der Schreibung Edison Denisov; * 6. April 1929 in Tomsk, Sibirien; † 24. November 1996 in …
26sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… …
27Artsybashev, Mikhail Petrovich — ▪ Russian author born Nov. 5 [Oct. 24, Old Style], 1878, Kharkov province, Ukraine, Russian Empire [now Kharkiv province, Ukraine] died March 3, 1927, Warsaw, Poland Russian prose writer whose works were noted for their extreme pessimism,… …
28mineral deposit — Introduction aggregate of a mineral in an unusually high concentration. About half of the known chemical elements (chemical element) possess some metallic (metal) properties. The term metal, however, is reserved for those chemical… …
29Madison Group — Madison Limestone Stratigraphic range: Mississippian …
30Red River Formation — Stratigraphic range: Caradoc to Ashgill …
