fine-grained sediment
71Dropstone — Examples of dropstones from the Eocene, when it has been suggested that there were no ice sheets.[1] Dropstones are isolated fragments of rock found within finer grained water deposited sedimentary rocks. They range in size from small pebbles to… …
72chert and flint — Very fine grained quartz, a silica mineral with minor impurities. Flint is gray to black and nearly opaque (translucent brown in thin splinters). Opaque, dull, whitish to pale brown or gray specimens are called simply chert. Chert and flint… …
73Vargas tragedy — A part of Vargas state after the 1999 mudslides Date December 14, 1999 (1999 12 14) December 16, 1999 (1999 12 16) Location …
74Loess — is a homogeneous, typically non stratified, porous, friable,slightly coherent, often calcareous, fine grained, silty, pale yellow or buff, windblown (aeolian) sediment. [Richthofen, F. von. 1882. On the mode of origin of the loess. The Geological …
75Conglomerate (geology) — For a kind of corporation, see Conglomerate (company). Conglomerate Sedimentary Rock Boulder of conglomerate with cobble sized clasts. Rock hammer for scale …
76hydrosphere — /huy dreuh sfear /, n. the water on or surrounding the surface of the globe, including the water of the oceans and the water in the atmosphere. [1885 90; HYDRO 1 + SPHERE] * * * Discontinuous layer of water at or near the Earth s surface. It… …
77Jurassic Period — Interval of geologic time, 206–144 million years ago, that is one of the three major divisions of the Mesozoic Era, preceded by the Triassic Period and followed by the Cretaceous. During the Jurassic, Pangea began to break up into the present day …
78Hornfels — (German, meaning hornstone ) is the group designation for a series of contact metamorphic rocks that have been baked and indurated by the heat of intrusive igneous masses and have been rendered massive, hard, splintery, and in some cases… …
79arctic — arctically, adv. /ahrk tik/ or, esp. for 7, /ahr tik/, adj. 1. (often cap.) of, pertaining to, or located at or near the North Pole: the arctic region. 2. coming from the North Pole or the arctic region: an arctic wind. 3. characteristic of the… …
80clay — 1. A rock or mineral fragment or a detrital particle of any composition smaller than a very fine silt grain, having a diameter less than 1/256 mm (4 microns, or 0.00016 in., or 8 phi units.) This size is approximately the upper limit of size… …
