mineral formation
41Nacimiento Formation — The Nacimiento Formation is a sedimentary rock formation found in the San Juan Basin of western New Mexico (United States)[1] and named for the Nacimiento Mountains. It is a heterogeneous nonmarine formation composed of shale, siltstone, and… …
42Chalk formation — Chalk Chalk (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See {Calz}, and {Cawk}.] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as… …
43Holston Formation — The Holston Formation, alternately known as the Holston Limestone, is a stratigraphic unit of Ordovician age within the Chickamauga Group in the Ridge and Valley physiographic province of the southeastern United States. A convert|120|mi|km|adj=on …
44Chugwater Formation — (Group) Stratigraphic range: Triassic Outcrop of Chugwater Group near Thermopolis, Wyoming Type sedimentary Underlies …
45Bakken Formation — Infobox Rockunit name = Bakken Formation caption = Map of Williston Basin oil fields with reservoirs in Bakken Formation (Saskatchewan is north border). Most oil comes from Elm Coulee Oil Field type = Geological formation prilithology = Shale,… …
46Banded Iron Formation — Bändereisenerz aus Nordamerika, 2,1 Milliarden Jahre alt Bändereisenerz von Upper Michigan, U.S.A. Ein Bändererz ist ein eisenhaltiges, marines …
47Muskwa Formation — Stratigraphic range: Frasnian …
48hydrothermal mineral deposit — ▪ geology any concentration of metallic minerals formed by the precipitation of solids from hot mineral laden water (hydrothermal solution). The solutions are thought to arise in most cases from the action of deeply circulating water heated …
49Martinsburg Formation — A sample of the Martinsburg shale from the Pennsylvania Turnpike (Northeast Extension) at mile post 66. The Ordovician Martinsburg Formation (Om) is a mapped bedrock unit in Pennsylvania, New Jersey, Maryland, Virginia, and West Virginia. It is… …
50Reedsville Formation — The Ordovician Reedsville Formation (Or) is a mapped bedrock unit in central Pennsylvania that extends into the subsurface of Ohio. This rock is a slope former adjacent (and stratigraphically below) to the prominent ridge forming Bald Eagle… …
