A Packstone: grain supported by small grains (width of picture is 7mm) Under the Dunham classification (Dunham, 1962 [1]) system of limestones, a packstone is defined as a grain-supported carbonate rock that contains 1% or more mud-grade fraction.

Packstone a grain-supported fabric containing 1% or more mud-grade fraction. Grainstone a grain-supported carbonate rock with <1% mud. Recognising that these classes did not encompass all carbonate lithologies, Dunham defined …

Packstone: Grain-supported muddy carbonate rock (Dunham, 1962). Lucia (1999) divided packstones into mud-dominated (pore spaces totally filled with mud) and grain-dominated (some intergrain pore space is free of mud) packstones.

For example, if the grains of a limestone are touching one another and the sediment contains no mud, then the sediment is called a grainstone. If the carbonate is grain supported but contains a small percentage of mud, then it is known as a packstone.

Oct 26, 2000 · Two carbonate classification systems are in common use today, one by R.L. Folk and the second by R.J. Dunham . The Dunham system is based on depositional texture (that is, the amount of matrix surrounding the grains at the time of deposition). It uses such names as mudstone, wackestone, packstone, grainstone, and boundstone.

Dec 19, 2023 · Packstone: a grain-supported rock with lime mud presented, and original components are not organically bounded together during deposition (Figure 15). Grainstone: a grain-supported rock with lime mud absent, and original components are not organically bounded together during deposition (Figure 16).

E & F) Polished slab and photomicrograph (PPL) of a skeletal packstone. Although the shells in the slab are somewhat widely spaced, this sample is grain supported because the shells are curved three dimensional forms that are touching each other in the third dimension.

Sep 4, 2019 · Embry and Klovan added three new categories: Bafflestone where organisms trap sediment. By their own admission, Embry and Klovan note that identification of organisms responsible for trapping is equivocal. Framestone that is constructed by framework-building organisms like corals and stromatoporids. So which scheme does one use?

May 11, 2016 · A recrystallized bioturbated coarse-grained gastropod packstone with isolated intraparticle pores may be a perfectly accurate name but are all of these modifiers required? Would bioturbated gastropod packstone be equally effective?

Packstone of resedimented micritic ooids, aggregate grains and intraclasts. This packstone was depositied as a deep-water apron with ooids shed from a nearby platform margin. Skeletal packstone-grainstone with gastropods and bivalves and micritic vadose meniscus cement followed by blocky sparite.