Sorting - a conglomerate comprising a mixture of clast sizes is poorly sorted, while one comprising mostly clasts of the same size is well sorted;. Lithology - a conglomerate where the clasts represent more than one rock type is termed polymictic or petromictic , while one where the clasts are of a single rock type are monomictic or oligomictic.
Other specimens - Click the thumbnails to enlarge. Measure ad performance. Select basic ads. Create a personalised ads profile. Select personalised ads. Apply market research to generate audience insights. Measure content performance. Develop and improve products.
List of Partners vendors. Share Flipboard Email. Anne Marie Helmenstine, Ph. Chemistry Expert. Helmenstine holds a Ph. She has taught science courses at the high school, college, and graduate levels. Facebook Facebook Twitter Twitter. Sand, silt, or clay sediment, called matrix , fills the spaces between the clasts and cements them together Conglomerate is relatively uncommon. Featured Video. Cite this Article Format.
Helmenstine, Anne Marie, Ph. Conglomerate Rock: Geology, Composition, Uses. Get to Know 24 Types of Sedimentary Rock. Analysis of conglomerate can sometimes be used as a prospecting tool.
For example, most diamond deposits are hosted in kimberlite. If a conglomerate contains clasts of kimberlite, then the source of that kimberlite must be upstream of the location where the kimberlite clast was deposited. That sounds simple, but the kimberlite clast might have been deposited a few million years ago in a different landscape - but people have been successful in using this type of clue to successfully locate a diamond deposit.
In rare instances, conglomerate can be a "fossil placer deposit" containing gold , diamonds, or other valuable minerals. These conglomerates are mined, crushed, and processed as ores.
Puddingstone: Puddingstone is a conglomerate composed of clasts that contrast sharply with the rock matrix. This rock in the photo is a specimen of the Hertfordshire puddingstone, from the lower Eocene of the London Basin.
It consists of colorful flint pebbles in a white to brown silicate matrix. This type of rock is found at many locations in Hertfordshire County, England. Puddingstone is a nonscientific name for a conglomerate made up of clasts that contrast sharply with the color of the rock's matrix.
People in what is today the United Kingdom were the first to use the name. They claim that the rocks reminded them of a "plum pudding". Puddingstones are found in many parts of the world. Learn more about puddingstone here! It shows an outcrop of conglomerate and some pebble-size weathering debris. The round pebbles are too large to have been moved and shaped by wind, thus they had to have been transported a significant distance by water.
This photo from September was the strongest evidence of the existence of water on Mars that had been obtained at that time. See more Earth-like rocks on Mars. The rounded clasts within the conglomerate provide evidence that a stream or a beach had moved the rocks and tumbled them into rounded pebbles.
This conglomerate is one of the most convincing evidences that water once flowed on the surface of Mars see the accompanying photo. How Does It Form? What Is It Used For? Article by: Hobart M. Find Other Topics on Geology. Maps Volcanoes World Maps. What Is Conglomerate? Composition Formation Conglomerate vs. Breccia Uses Puddingstone Conglomerate on Mars. Rock, Mineral and Fossil Collections. Hardness Picks. Flint, Chert, and Jasper. Tumbled Stones. Fluorescent Minerals.
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