concretionary sand

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Marcellus Formation — Stratigraphic range: Middle Devonian … Wikipedia
Concretion — For other uses, see enterolith and nodule (geology). Septaria redirects here. For the genus of gastropods, see Septaria (gastropod). Concretions on Bowling Ball Beach (Mendocino County, California) weather out of steeply tilted Cenozoic mudstone… … Wikipedia
Rock City, Kansas — Rock City is a park located on hillsides overlooking the Solomon River in Ottawa County, Kansas. It is 3.6 miles south of Minneapolis, Kansas and just over 0.5 mile west of K 106 and the Minneapolis City County Airport on Ivy Road at coor… … Wikipedia
Ironstone — is a fine grained, heavy and compact sedimentary rock. Its main components are the carbonate or oxide of iron, clay and/or sand. It can be thought as a concretionary form of siderite. Ironstone also contains clay, and sometimes calcite and quartz … Wikipedia
concretion — [kən krē′shən] n. [L concretio: see CONCRETE] 1. a solidifying or being solidified 2. an act or instance of concretizing 3. a solidified mass; specif., a) Geol. an inclusion in sedimentary rock, usually rounded and harder than the surrounding… … English World dictionary

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