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Trace fossils may consist of physical impressions made on or in the substrate by an organism. [3] For example, burrows , borings ( bioerosion ), urolites (erosion caused by evacuation of liquid wastes), footprints , feeding marks, and root cavities may all be trace fossils.
' 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 ...
Many examples cited as modern or fossil raindrop impressions can be explained by air bubbles rising through the mud. 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]
There have been some discoveries of unusually well-preserved fossil dinosaur specimens which bear remnants of tissues and bodily structures.Organic tissue was previously thought to decay too quickly to enter the fossil record, unlike more mineralised bones and teeth, however, research now suggests the potential for the long-term preservation of original soft tissues over geological time, [1 ...
Fossil of Sinornithosaurus millenii, the first evidence of feathers in dromaeosaurids Cast of a Caudipteryx fossil with feather impressions and stomach content Fossil cast of a Sinornithosaurus millenii Jinfengopteryx elegans fossil. Many non-avian dinosaurs were feathered. Direct evidence of feathers exists for the following species, listed in ...
Fossil seed fern leaves from the Late Carboniferous of northeastern Ohio. 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 ...
A typical example of a possibly re-used concavity is the footprint on Dunadd which some locals at one time thought was a cast for a bronze axe head. [2] The Meister Print is a pseudofossil of what looks like a footprint of a human foot wearing a sandal with a trilobite fossil in the print has been quoted by anti-evolutionists to show that ...
Krukowski Quarry is a quartzite sandstone quarry near Mosinee, Wisconsin.In the late Cambrian period (510 m.y.a), this area was a beach and shoreline, and the quarry is well known for abundant fossil impressions of Climactichnites, Protichnites, and beached jellyfish, Scyphozoan Medusae.