packstone

packstone

[′pak‚stōn]
(petrology)
A sedimentary carbonate rock whose granular material is arranged in a self-supporting framework, yet also contains some matrix of calcareous mud.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Carbonate textures range from mudstone to grainstone; wackestone is dominant, but packstone is also common.
Sponges are intact, of low-profile, semi-infaunal between thinly-laminated mudstone to packstone interlaminated with thin shale (Astraeospongid) to epifaunal (Astylospongia, Hindia, Palaeomanon).
Lithologically, the OS succession is dominantly composed of alternating intervals of mudstone (MS) oil shale and wackestone (WS) oil shale, the latter with very local occurrences of packstone laminae or nests.
The Upper Sinemurian, Pliensbachian and Lower Toarcian deposits of the Rodiles section are constituted by couplets of bioclastic lime mudstone to wackestone, occasionally containing bioclastic packstone facies commonly concentrated in gutters, and grey to black marls, deposited in an open marine external platform environment.
The carbonate is of wacke-stone and packstone and is locally silty and argillaceous.
Bivalve, Brachiopodal Sandy Packstone (MF6): This facies is 1.86m thick.
The dolomitic part of K1 is characterized to be mudstone, mudstone to packstone, beige, moderately hard to hard, crystalline to cryptocrystalline, have occasional pelloids, pebbles and shell fragments, have local mudcracks in mudstone, slightly argillaceous in parts, have thin layers of anhydrite and o have good to fair vuggy and intercrystalline porosity.
Unit 2 represents a reef front environment and is 4.5m thick; it is a massive unit (packstone) containing solitary corals in growth position, colonial corals such as Diploria and Porites, unidentified burrows, Pecten, crabs remains, M.