root cast

root cast

[′rüt ‚kast]
(geology)
A slender, tubular, near-vertical, and commonly downward-branching sedimentary structure formed by the filling of a tubular opening left by a root. Also known as rhizoconcretion.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The earliest root casts in Puerto Rico were dated Late Cretaceous (probably Santonian, 85.8-83.5Ma).
In Punta Jacinto, located at Playa Jobos in Isabela, northern Puerto Rico, there is a typical example of aeolian fossilized dunes having plant root casts (rhizoliths).
At a field site near Sarnia, Ontario, root casts were observed in glacial till fractures to depths of 3.0 to 4.0 m (Ruland and others 1991).
Berner's findings may receive an additional boost when the Tennessee researchers analyze the fossil soils found with the root casts. Elick says her next step is to determine the ratio of carbon-12 to carbon-13 isotopes in carbonates from the ancient soil (SN: 8/28/93, p.