rhizoconcretion

rhizoconcretion

[¦rī·zō·kän′krē·shən]
(geology)
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References in periodicals archive ?
Root molds resembling calcareous rhizoconcretions were similar to others discovered locally within the Early Jurassic Moenave (Kirkland and Milner, 2006) and Kayenta formations (Difley and Ekdale, 2006).
The upper coal occurs above a blocky greenish-grey shale with siderite rhizoconcretions and below a laminated grey shale.
Gardiner (2005) documented the presence of pedogenic mud aggregates in laminated siltstones, mudchip rip-up clasts, and carbonate rhizoconcretions in an interval that corresponds to the 952-1041 m interval in our measured section.
Vertically oriented, unbranched calcareous rhizoconcretions are present in red mudrocks at 179 m.
Although no root tissue was observed, these clasts are otherwise identical to the calcareous rhizoconcretions described by Falcon-Lang et al.
Ubiquitous drab haloed root compressions are characteristic of the formation; calcareous rhizoconcretions and amalgamated (dm-scale) carbonate nodules occur locally.