The word 'fragmental' is a correct and usable word in written English.
It is an adjective that means composed of fragments or incomplete parts. Example: The sculpture was made up of fragmental pieces of broken glass, creating a stunning and unique work of art.
Many of the deposits are not normal lava flows but rather flow breccias, mudflows, tuffs, and other fragmental rocks; the peperino near Rome and the trass of the Eifel district in Germany are examples.
Seaward of it is the fore reef, descending into deeper water and floored deeper down by fragmental material derived from the reef.
When explosions occur underground, the fragmental material may be forced violently into the surrounding rocks, forming intrusive tuffs (peperites).
Storms and surf heap up fragmental material into beaches and shoals, and the shoals may develop into low sandy or rubbly islets or cays on top of the reef.
Its extrusions cover about 1,250 square miles (3,200 square km) and consist largely of fragmental rocks and only a smattering of lavas.
Stratification, the layering that occurs in most sedimentary rocks and in those igneous rocks formed at the Earth's surface, as from lava flows and volcanic fragmental deposits.
Fragmental volcanic material becomes sorted in flight under the influence of gravity, particle size, and wind.
Mount Elgon is part of the Eastern Volcanics in Uganda, which consist of soda-rich lavas and associated fragmental tuffs and agglomerates.
Two main natural textural groupings exist for sedimentary rocks: clastic (or fragmental) and nonclastic (essentially crystalline).
Siliceous rock, any of a group of sedimentary rocks that consist largely or almost entirely of silicon dioxide (SiO2), either as quartz or as amorphous silica and cristobalite; included are rocks that have formed as chemical precipitates and excluded are those of detrital or fragmental origin.
Here the copper occurs in interbedded conglomerates (a sedimentary rock consisting of pebbles and boulders) and basaltic lava flows, most of which are vesicular and have fragmental layers of basaltic rubble on top of each flow.
