References and Recommended Reading
4 Jan Fossils provide scientists with many clues about Earth's history, offering evidence of dinosaurs and strange plants that existed in the past. This lesson will define a fossil, look at different types and characteristics of fossils, and then describe how fossils are formed. A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved. However, by itself a fossil has little meaning unless it is placed within some context. The age of the fossil must be determined so it can be compared to other fossil species from the same time period. 25 Apr Fossils are the remains of prehistoric organisms or other evidence those organisms left behind. There are a number of different kinds of fossils, including molds and casts, petrification fossils, whole body fossils, footprints and trackways and coprolites, among others. Fossils that consist of all or part of a plant.
The four types of fossils are: There are six ways that organisms can turn into fossils, including: More rarely, fossils have been found of softer body tissues. Bones - these fossils are the main means of learning about dinosaurs. The fossilized bones of a tremendous number of species of dinosaurs have been found sincewhen the first dinosaur bone was discovered.
Teeth and Claws - Sometimes a bit of a broken tooth of a carnivore is found with another dinosaur's bones, especially those of herbivores. Lots of fossilized teeth have been found, including those of Albertosaurus and Iguanodon.
EggsEmbryosand Nests - Fossilized dinosaur eggs were first found in France in Many fossilized dinosaur eggs have been found, at over sites. Sometimes they have preserved parts of embryos, which can help to match an egg with a species of dinosaur.
The embryo also sheds light on dinosaur development. The nests and clutches of eggs tells much about dinosaurs' nurturing behavior. A dinosaur egg was found by a 3-year-old child. Skin - Some dinosaurs had thick, bumpy skin, like that of an alligator. A year-old girl discovered a T. Recently, a beautiful theropod fossil, Scipionyxwas found with many impressions of soft tissue preserved.
These million-year-old embryos support the emergence of some aspects of arthropod development earlier than previously thought in the late Proterozoic. Interval of time when the earth's magnetic field is oriented so that the magnetic north pole is approximately in the same position as the geographic north pole neutrons: The fossil record is strongly biased toward organisms with hard-parts, leaving most groups of soft-bodied organisms with little to no role.
Also rare are so-called dinosaur "mummies", fossilized imprints of dinosaur skin and other features. These are not real mummies in which actual animal tissue is preserved, but fossils that look a bit like mummies.
There are many types of trace fossils. Even the lack of trace fossils can yield information; the lack of tail-furrow fossils indicates an erect tail stance for dinosaurs that were previously believed to have dragged their tails.
Trackways sets of footprints http://24dating.me/kexi/how-to-write-a-short-hookup-profile.php Dinosaur tracksusually made in mud or fine sand, have been found at over sitesincluding quarries, coal mines, riverbeds, deserts, and mountains.
Different methods of dating fossils
There are so many of these fossils because each dinosaur made many tracks but had only one skeleton and because tracks fossilize well. Fossil footprints have yielded information about: Speed and length of stride whether they walked on two or four legs the bone structure of the foot stalking behavior a carnivore hunting a herd of herbivores the existence of dinosaur herds and stampedes how the tail is carried few tail tracks have been found, so tails were probably held above the ground Unfortunately, linking a set of tracks with a particular species is often virtually impossible.
Types of Fossils
Although there were many more plant-eating dinosaurs sauropods and ornithopods than meat-eating dinosaurs theropodsmany more footprints of meat-eaters have been found. This may be because the meat-eaters walked in muddy areas where footprints are more likely to leave a good impression and fossilize more frequently than the plant-eaters. Toothmarks - Toothmarks generally appear in bones.
Gizzard Rocks - Some dinosaurs swallowed stones to help grind their food modern birds do this also. These stones, called gastroliths literally meaning stomach-stoneshave been found as fossils.
Dating Rocks and Fossils Using Geologic Methods
They are usually smooth, polished, and rounded and hard to distinguish from river rocks. Coprolite s fossilized feces - Coprolites yield information about the dinosaurs' diet and habitats. Coprolites up to 40 cm 16 inches in diameter have been found, probably from a sauropodconsidering its size.
Fossil trading is the practice of buying and selling fossils. Retrieved 30 April Using the overlapping age ranges of multiple fossils, it is possible to determine the relative age of the fossil species i.
A huge theropod coprolite was recently found Sasketchewan, Canada. The source meat-eater large enough in that area at that time was Tyrannosaurus rex.
Burrows and Nests - Fossils of dinosaurs' burrows and nests can reveal a lot about their behavior. Dinosaur Word Search Puzzle. Our subscribers' grade-level estimate for this page: First Dino Fossil Discoveries.
Printouts Math Music Word Wheels.
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