Fossils

Trace fossils are fossilized tracks and other evidence of the activity of organisms. For example, a set of tracks, you might be able to learn something about the social life of sauropods, which were large, plant-eating dinosaurs. The largest tracks of the herd are on the outer and the smallest are on the inside. This tracks led some scientists to hypothesize that adult sauropods surrounded their young as they traveled- perhaps to protect them from predators. A nearby set of tracks might mean that another type of dinosaur, an allosaur, was stalking the herd.

I can answer part of this question. If they can scientists use carbon dating to find the closest age of the fossil. If carbon dating is not possible they use a different technique such as this: If they look at the layers of the rocks, the rocks before and after the layer of rock the fossil was found in, can show an estimate of how old the fossil can be if they know the age of the rock layers before and after its layer.

Myalina, a clam fossil.

Fish

Answer this question… A rabbit in the Arctic has fur that blends in with snow.

A person who studies rocks and fossils is called an archeologist.

No, the study of fossils is called paleontology and the study of rocks is called geology, so a person studies fossils is called a paleontologist.

http://en.wikipedia.org/wiki/Archeology

http://en.wikipedia.org/wiki/Paleontology

The state of Virginia has a spectacular array of fossils, from 540 million year old burrows to one million year old Mastodon teeth. Most fossils are found in the Piedmont Province and Blue Ridge.

Fossils are never found in Igneous rocks

Trace Fossils!

According to Biologists, the large domain that includes the oldest known fossil cells is called bacteria within the prokaryotic microorganism.

they see how deep these rocks are in the earth then they predict ---- Carbon dating is another popular method, by which fossils and other historical artifacts are tested to record levels of a common carbon isotope with a certain half-life.

Most sedimentary rock is formed by layered sediment (sand,silt,clays, mud) packing on top on each other over millions of years which, under intense pressure, are compressed into rock. Dead animal corpses that existed in an oxygen deprived environment (swamps,bogs,seafloors) fail to entirely decompose before sediment completely buries them. They in turn are solidified by the same process and their bones go underneath a process where all the organic material is replaced (mineralization). The mineralized structures resemble the bone structure of the animal (a fossil!). This would not occur in metamorphic or igneous rock as the origin of these rock forms are too hot, too compressed, and too deep in the earths crust for mineralized animal remains to exist.

A ripple mark is not a kind of rock in and of itself, but a feature found in some sedimentary rocks, usually sandstones.

Radioactive elements tend to degrade or give off radiation at a constant rate. That is an essential part of radioactive carbon dating. Uranium, for instance has a has half life of 5,400 years. Each 5,400 years, half of the uranium becomes inert lead. It is considered an accurate form of dating.

ash-fall fossil formatin is very unique in its formation. 1. a volcano erupts, and ash is spread through the area. 2. an animal breathes in ash and dies. the animal is covered in ash. 3. soft tissues start to decompose as more ash starts to pile. 4. more ash continues to pile on top of the dead animal, and it turns to a rock. if this isn't very accurate go to www-museum.unl.edu/research/vertpaleo/ashfall.HTML

fyi this website doesnt work

Where are you people getting these ill posed questions? What level? Transitional forms!

At the species level this would be explained as a rapid (geologically rapid) speciation event followed by years of stasis, where little morphological change is taking place.

Radiocarbon dating is a technique that uses the decay of carbon-14.

It is estimated that the very first fossils were found 3 billions years ago. There is really no way to know if the dates were not recorded.

Intermediate species forms, yes. A the taxa level, no. Still, not all taxa evidence is supportive of punctuation and stasis. Punctuated equilibrium is only one explanation of how evolution occurs in some species, not all species. The little shellies evidence gradualist processes very well.

Fossils are preserved only in sediments, that is rocks formed either by the break up and transportation of existing rock by water as mud or silt, more rarely sandstone or even coarser fragments or by the precipitation of minerals, mainly calcium carbonate that forms limestone or a relative. The organisms preserved are usually resistant to erosion and disintegration like seashells and sometimes bone.

Many insects get trapped in amber. Amber is fossilized tree resin.

Carbon14 dating (isotopic dating)

A widely distributed sedimentary structure consisting of laminated carbonate or silicate rocks, produced over geologic time by the trapping, binding, or precipitating of sediment by groups of microorganisms, primarily cyanobacteria.

First humanoids (Sahelanthropus tchadensis): 7 000 000 years ago

First modern humans (Homo sapiens sapiens): 195 000 years ago