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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.
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Antiquiala snyderae was identified from only the type specimen, the holotype, number SR 08-10-08 A&B, which is a compression fossil preserved in the Stonerose Interpretive Center paleoentomological collection. The holotype was found at the Klondike Mountain Formations "B4131" locality, [2] also called the "Boot hill" site. [3]
Index fossils must have a short vertical range, wide geographic distribution and rapid evolutionary trends. Another term, "zone fossil", is used when the fossil has all the characters stated above except wide geographical distribution; thus, they correlate the surrounding rock to a biozone rather than a specific time period.
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 are studied by dissolving the surrounding matrix with acid and then using light or scanning electron microscopy to examine surface details. [ 12 ] The earliest fossils possessing features typical of fungi date to the Paleoproterozoic era, some 2,400 million years ago ( Ma ); these multicellular benthic organisms had ...
Fossils have been recovered from every rock type in the Llewellyn but are predominantly found in the siltstone, shale, and coal layers. The compression fossils from the Llewellyn formation are well known for the striking white color on the dark stone. An important location for these fossils is near St. Clair, Pennsylvania.
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 ...