grainstone

grainstone

[′grān‚stōn]
(petrology)
A mud-free (micrite-free) limestone.
References in periodicals archive ?
Six microfacies comprised of 1) Ooidal Grainstone, 2) Peloidal, bioclastic Packstone, 3) Dolomitic Grainstone, 4) Peloidal Packstone, 5) Micropeloidal Wacke-Packstone and 6) Dolomitic Mudstone are recognized.
This belt contains 9 facies: bioclastic wackestone with pelagic bivalve and foraminifera (O1), coral boundstone (O2), marl with foraminifera (O3), bioclastic mudstone mudstone (O4), bioclastic floatstone (O5), bioclastic packstone (O6), sandy bioclastic packstone (O7), bioclastic packstone to grainstone (O8) and bioclastic grainstone (O9) (Figs.
Arwa (Kimmeridgian to Tithonian) Fm is composed of argillaceous limestone, deep-water lime mudstone, and locally minor packstone, wackestone, grainstone, and black shale.
Las Sedimentitas de Cruces estan constituidas por sublitoarenitas y litoarenitas con fragmentos de cuarzo, feldespato, micas, opacos, circon, epidota y liticos de rocas sedimentarias y volcanicas; intercaladas con biomicritas con textura wackestone, bioesparitas arenosas con textura grainstone y lodolitas arenosas calcareas.
It is mimetically and/or nonmimetically replaced packstone/ grainstone and its crystals are unimodal, nonplanar-anhedral.
En dicho modelo, la rampa interna estaria constituida principalmente por calizas grainstone ooliticas, peloidales y bioclasticas; la rampa media, por calizas wackestone y packstone con abundantes algas tipo Beresella y esponjas calcareas tipo Chaetetes, y la rampa externa, por calizas wackestone con espiculas de esponjas y calizas micriticas bioconstruidas.
SAMPLE 1: DOLOMITIZED OOID GRAINSTONE WITH ISOPACHOUS DOLOMITE CEMENT
The Ninase Member contains fragments of brachiopods and crinoids, and also some tabulate corals (favositids) in the layers of marlstone intercalating with grainstone.
There are scattered bioclastic packstone and grainstone horizons which commonly show fining upward (Wong, 2002); these represent deposition during brief storm events.
Segun la clasificacion de Dunham se trata de un packstone con variaciones locales a grainstone y packstone esparitico.
A mound in Lawrence County consists chiefly of packstone and grainstone dominated by eclnirnoderrni ossicles amid fragments of fenestrate bryozoarns.