What is Polymict conglomerate?
A conglomerate consisting of fragments from an assortment of different rocks and/or minerals.
What is an Intraformational conglomerate?
A conglomerate occurring in the midst of a geologic formation, such as one formed during a brief interruption in the orderly deposition of strata. It may contain clasts external to the formation.
What is Oligomictic conglomerate?
1. A conglomerate containing clasts of only a few different rock types.
What are the types of conglomerate?
Five general types of conglomerate were considered, namely: marine, fluviatile, estuarine, lacustrine, and glacial. In addition to these, another type was studied, commonly known as crush-conglom- erate, but really pseudo-conglomeratic in its nature.
What is boulder conglomerate?
Conglomerate (/kənˈɡlɒmərɪt/) is a clastic sedimentary rock that is composed of a substantial fraction of rounded to subangular gravel-size clasts. A conglomerate typically contain a matrix of finer grained sediments, such as sand, silt, or clay, which fills the interstices between the clasts.
What is the meaning of Polymictic?
adjective. (also polymictic) Geology. (of a conglomerate) consisting of fragments of several different rock types.
What type of rock is gneiss?
gneiss, metamorphic rock that has a distinct banding, which is apparent in hand specimen or on a microscopic scale. Gneiss usually is distinguished from schist by its foliation and schistosity; gneiss displays a well-developed foliation and a poorly developed schistosity and cleavage.
What is the difference between a breccia and a conglomerate?
A clastic rock made of particles larger than 2 mm in diameter is either a conglomerate or breccia. A conglomerate has rounded clasts while a breccia has angular clasts. Since water transport rapidly rounds large clasts, breccias normally indicate minimal transport. The angular clasts mark this as a breccia.
What are the 2 kinds of conglomerate?
There are two broad types of conglomerates: (1) those whose pebbles are generally of one lithology, well-sorted (i.e., narrow size distribution), and matrix-poor; and (2) those with a heterogeneous pebble lithology, poorly sorted, and with abundant matrix. The degree of sorting indicates the method of deposition.
Why is boulder called boulder?
The city of Boulder is located in the Boulder Valley, where the Rocky Mountains meet the Great Plains. The creek was named prior to the city’s founding, for all of the large granite boulders that have cascaded into the creek over the eons. It is from Boulder Creek that Boulder city is believed to have taken its name.
What is conglomerate used for?
Most conglomerate rocks form in shallow water. A conglomerate rock is formed by pressure and “cemented” together with dissolved minerals. Conglomerate rocks are used in construction and as decorating stones, such as for buildings.
What is a Meromictic basin?
A meromictic lake is a lake which has layers of water that do not intermix. In ordinary, holomictic lakes, at least once each year, there is a physical mixing of the surface and the deep waters. The term meromictic was coined by the Austrian Ingo Findenegg in 1935, apparently based on the older word holomictic.
What is an intraformational conglomerate?
If these clasts consist of rocks and minerals that are identical to or consistent with the lithology of the enclosing matrix and, thus, penecontemporaneous and derived from within the basin of deposition, the conglomerate is known as an intraformational conglomerate.
What is the classification of conglomerates?
Conglomerates are also classified according to the composition of their clasts. A conglomerate or any clastic sedimentary rock that consists of a single rock or mineral is known as either a monomict, monomictic, oligomict, or oligomictic conglomerate.
What are intraformational and extraformational sedimentary rocks?
In sedimentary rock: Epiclastic conglomerates and breccias …of epiclastic conglomerates and breccias: intraformational, derived penecontemporaneously by eroding, transporting, and depositing material from within the depositional basin itself; and extraformational, derived from source rocks that lie outside the area in which the deposit occurs.
What are the characteristics of conglomerate rocks?
Rock hammer for scale. Conglomerate ( / kənˈɡlɒmərɪt /) is a clastic sedimentary rock that is composed of a substantial fraction of rounded to subangular gravel -size clasts. A conglomerate typically contain a matrix of finer grained sediments, such as sand, silt, or clay, which fills the interstices between the clasts.