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The characteristics of any impression depend on so many variables they can not be used convincingly to demonstrate those impressions formed specifically by raindrops. [5] In order for raindrop impressions to be preserved in the rock record, the impression would have to have occurred towards the end of a rain shower. The decreased number of ...
Trace fossils contrast with body fossils, which are the fossilized remains of parts of organisms' bodies, usually altered by later chemical activity or by mineralization. The study of such trace fossils is ichnology - the work of ichnologists. [2] Trace fossils may consist of physical impressions made on or in the substrate by an organism. [3]
' obtained by digging ') [1] is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the fossil record. Though the ...
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.
Plant fossils can be preserved in a variety of ways, each of which can give different types of information about the original parent plant. These modes of preservation may be summarised in a paleobotanical context as follows. Adpressions (compressions – impressions). These are the most commonly found type of plant fossil.
Compressions and impressions are the most extensive types of insect fossils, occurring in rocks from the Carboniferous to the Holocene. Impressions are like a cast or mold of a fossil insect, showing its form and even some relief, like pleating in the wings, but usually little or no color from the cuticle.
Richard Thulborn has used the term "underprint" to refer to a different phenomenon. Thulborn applied the term to track fossils created by the erosion of track casts where the removal of the cast from the track leaves only the impressions of pads in the underlying rock.
Pyrite disks or spindles are sometimes mistaken for fossils of sand dollars or other forms (see marcasite). Cracks, bumps, gas bubbles, and such can be difficult to distinguish from true fossils. Specimens that cannot be attributed with certainty to either fossils or pseudofossils are treated as dubiofossils. Debates on whether specific forms ...
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