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Fossil wood is wood that is preserved in the fossil record. Wood is usually the part of a plant that is best preserved (and most easily found). Fossil wood may or may not be petrified. The fossil wood may be the only part of the plant that has been preserved; [101] therefore such wood may get a special kind of botanical name.
The anterior part of the Meckelian groove is exposed on the medial side of the dentary close to the ventral margin of the bone, while the posterior part is enclosed by bone on both sides, only to open dorsally through the adductor fossa. [5] [16]: 44 mesethmoid The mesethmoid is a bone in the anterior part of the braincase.
The fossil vertebrae recovered at Dmanisi show lumbar lordosis, the orientation of the facet joints suggests that the range of spinal flexion in the Dmanisi hominins was comparable to modern humans and the relatively large cross-sectional areas of the vertebrae indicates resistance to increased compressive loads, suggesting that the hominins ...
Most pathologies preserved in theropod fossils are the remains of injuries, but infections and congenital deformities have also been documented. [1] Pathologies are less frequently documented in small theropods, although this may simply be because the larger bones of correspondingly larger animals would be more likely to fossilize in the first ...
Living or freshly dead bones are somewhat resilient, so metal blade injuries to bone generate a linear cut with relatively clean edges rather than irregular shattering. [13] Archaeologists have attempted to use the microscopic parallel scratch marks on cut bones in order to estimate the trajectory of the blade that caused the injury.
Jefferson presented fossil bones of a ground sloth found in a cave in western Virginia and named the genus . The species was ultimately named Megalonyx jeffersonii in his honor. [ 4 ] [ 5 ] [ 6 ] Jefferson corresponded with Cuvier, including sending him a shipment of highly desirable bones of the American mastodon and the woolly mammoth .
The findings mean Bryozoans are millions of years younger than previously thought.
The fossil record is very uneven and, with few exceptions, is heavily slanted toward organisms with hard parts, leaving most groups of soft-bodied organisms with little to no fossil record. [39] The groups considered to have a good fossil record, including a number of transitional fossils between traditional groups, are the vertebrates, the ...