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(circular holder is 1.0 centimeter in diameter)
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Sediments are defined as naturally-occurring, loose grains of any composition or origin at the Earth's surface (although they also occur in cave passages). Most sediments are lithogenous - they form by weathering and erosion of any type of rock. Some sediments are biogenous / biogenic - the remains, or fragmentary remains, of once-living organisms (animals, plants, microbes, etc.).
Sediments range in size from very small to enormous. In sedimentology, categories of grain sizes are given specific names - megaliths to clay. Almost all of the clastic-textured sedimentary rock record consists of grains that are boulder-sized or smaller.
In describing sediments, grain shape is also important. The four basic shape categories are: angular, subangular, subrounded, and rounded. Any given sediment sample usually has a mix of more than one of these categories.
If a sediment sample or a clastic-textured sedimentary rock consists of angular to subangular grains, it was likely deposited relatively close to the source area of the sediments. With transportation and abrasion in streams, sediments gets smaller and more rounded.
Elmer W. Oliver Nature Park, Mansfield, TX
04.25.14
Sources: Shinners & Mahler's Flora of North Central Texas, p. 284 & 286; www.wildflower.org/plants/result.php?id_plant=MAGO; www.plants.usda.gov/core/profile?symbol=MAGO; www.davesgarden.com/guides/pf/go/137646/; www.inaturalist.org/taxa/84262-Matelea-gonocarpos.
Note: This is the back of the leaf.
Other common name: Anglepod
Location at ONP: elm forest
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