Search results
Results from the WOW.Com Content Network
A compression fossil is a fossil preserved in sedimentary rock that has undergone physical compression. While it is uncommon to find animals preserved as good compression fossils, it is very common to find plants preserved this way. The reason for this is that physical compression of the rock often leads to distortion of the fossil.
The specimens of Eoplectreurys are preserved as compression fossils in the fine-grained lacustrian rocks and thus have been flattened from their dimensions in life. [1] Due to the lack of exterior genitalia on females, it is very difficult to identify possible Eoplectreurys females from among the number of Haplogynae spiders found in the Daohugou formation. [1]
In geology, the term compression refers to a set of stresses directed toward the center of a rock mass. Compressive strength refers to the maximum amount of compressive stress that can be applied to a material before failure occurs.
Ginkgo huttonii is known largely by compression fossils of its leaves. Similar to other members of the Ginkgoites, the fossil leaves of G. huttonii are simple, four-lobed, and have dense, radially disposed venation. [3] [2] G. huttonii fossil seeds are frequently found as well as at least a few fossilized male catkins. [4]
Compression fossils, such as those of fossil ferns, are the result of chemical reduction of the complex organic molecules composing the organism's tissues. In this case the fossil consists of original material, albeit in a geochemically altered state.
The term "Okanagan Highlands" for Eocene formations of the region was coined by Wesley Wehr and Howard Schorn in a 1992 Washington Geology paper on the conifer research at Republic. The name was derived from the current Okanagan Highlands but applied to the, as then identified, microthermal forests preserved at Republic and Princeton. [ 18 ]
While most members of the group are known from compression fossils, several members of Archipsyllidae are 3 dimensionally preserved in Burmese amber, which has helped clarify the morphology and phylogenetic position of the group.
The majority of the lake deposits are compression fossils in lake bed sediments noted for both the paleofauna and paleofloras, with an additional pair of important non-compression biotas. A permineralized chert flora, the Princeton Chert is found along the Similkameen River interbedded with coal deposits of the Ashnola shale unit, Allenby ...