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.
References in periodicals archive ?
The specimens studied come from a packstone bed cropping out near the waterline of the Serga River, with a high content (60%) of crinoid stem fragments.
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.
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.
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.
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.
5km al NNE de Santa Maria de Bata, muestra niveles calcareos importantes representados por wackestone y packstone de crinoideos y braquiopodos.
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.