Fossils

The oldest organisms can generally be found in the lower layers of rock, as these layers were formed earlier than the upper layers. By examining the relative positions of different rock layers, scientists can determine the ages of the organisms found within them.

Yes, index fossils are special fossils that act as geological tools enabling comparison in time of a range of geological units and environment. Normally, they are selected using certain attributes such as the fossil should be widespread, abundant, fast evolving, and independent of their environment.

Baltic amber is often believed to be tree sap but it is resin from the tree. Baltic amber is sometimes sold as jewlery. It can be classified as a gem stone though it is simply hardened tree resin.

I've included three links, as I found your question very interesting. To be a fossil or ancient remnant, it helps to be in abundance. Sharks lose their teeth and grow new ones. It is important that the remains are not subject to decomposition. The sharks teeth are very hard and covered with enamel. The shark's body is made of cartilage and easily decomposes, so in time all that remains is his scales and teeth. Being buried in sediments or underwater, can protect the teeth from air and bacteria that can cause decomposition. Please see links for more information, including the awesome Stechacanthus shark. Also, one link states that shark's teeth come mostly from the Miocene period. It is probably true that most of the teeth found come from this period. However, sharks were around during the Paleozoic era, Devonian period, and survived the Permian-Triassic time period of massive extinctions. Really quite fascinating

Because they want 2

This situation can occur due to natural geological processes such as faulting or erosion, which can disrupt the original sequence of deposition. These processes can result in older rock layers ending up on top of younger ones, creating an apparent inversion of the typical order of fossil accumulation. It is important for paleontologists to consider these geological factors when interpreting the sequence of fossils in a particular area.

Dinosaurs lived during the Mesozoic Era, which is divided into three periods: Triassic, Jurassic, and Cretaceous. Fossils of dinosaurs have been found primarily from the late Triassic to the end of the Cretaceous period.

The half-life is 4 days. That means half of it will be gone in 4 days, and that leaves half of the original sample. In another 4 days, half of the remaining half will have decayed. And that will leave only 1/4 th of the original sample. That means 3/4 ths of the original sample will have decayed. In 8 days, three fourths of a sample of a radioactive element with a half-life of 4 days will have decayed.

Dinosaurs have been found on all 7 continents, even Antarctica.

its soft body is unlikely to be preserved in the fossilization process, which typically requires rapid burial and the gradual replacement of organic material with minerals. This means that the chances of a worm being preserved as a fossil are low compared to harder-bodied organisms.

Evolution doesn't necessarily produce incomplete or half-developed organs because intermediate stages can still provide a survival advantage. Incomplete structures, like half an eye, could provide some function, such as detecting light, which could be advantageous in survival. Additionally, many transitional forms with different stages of organ complexity have been found in the fossil record.

Paleontologists look for index fossils in fossil bearing sedimentary rock. Index fossils are organisms that were widespread, rapidly evolving, and only existed for a short period of time as evidenced by their appearance in the fossil record of specific rock strata. The appearance of a fossil alongside an index fossil gives a rough approximation of the age of the fossil in relative terms as it would appear on the geologic time scale. The appearance of the same fossil alongside index fossils of different geologic ages means that the fossil organism spanned multiple geologic time periods. Associations of specific strata alongside radiographically datable igneous and metamorphic rock determines the absolute age of a fossil.

It would be wise to rephrase this more specifically but with this much information to deal with the question it is hard to tell what you are really asking. I would assume the cave men discovered human bones when they broke their legs with clubs or when another one got chewed up by a large dinosuar. >.<

Fossil evidence of early whale ancestors, such as Ambulocetus and Pakicetus, shows features that suggest they were semi-aquatic animals that likely walked on land and swam in water. These fossils exhibit characteristics like limb structure and bone density that indicate a transition from terrestrial to aquatic life. Additionally, the genetics of modern whales show a link to terrestrial mammals like even-toed ungulates.

Fossils can only form when the remains of a plant or animal are buried in sediment quickly after death. The organic tissues are gradually replaced by minerals from the surrounding environment, creating a fossilized replica of the original organism. The process of fossilization usually requires specific conditions such as lack of oxygen, minimal disturbance, and the presence of water and minerals.

If the isochron slope is 0.0077, the age in millions of years when the first evidence of abundant fossils would be around 129 million years (1/0.0077). This calculation assumes a linear relationship between the isochron slope and time.

Helix fossil turns into Omanyte once you bring it to the Fossil guy on Cinnabar Island in the old Research facility. The Dome fossil turns into Kabuto. And then you can get the Amber from the Museum, which will turn into Aerodactyl

Water levels on earth have changed a lot over time. If you imagine 150 million years ago most of the UK (where i live) was under 100's of metres of sea water!!

If a fish died then, was buried and fossilised, then the sea levels dropped, he will still remain buried where he was and so could be on land today.

Also land can rise, (like when mountains form from 2 pieces of land pushing against each other and squeezing the middle up) so the buried fish can be pushed up with this rising land.

Diatoms and foraminifera are two groups of organisms that are key sources of food in aquatic environments and whose fossilized forms are used as a filter and as a grinding and polishing agent. Diatoms are a type of algae with unique silica cell walls, while foraminifera are marine protozoa that secrete calcareous shells.

The process of changing the hard parts of animal or plant remains with minerals is called fossilization. This process can involve the replacement of organic materials with minerals, preserving the structure of the original organism as a fossil for scientific study.

A trace fossil is evidence of an organism's activity (like footprints, burrows, or coprolites) but is not made of the organism itself. Trace fossils provide valuable information about the behavior and ecology of ancient organisms.

Fossils of dinosaurs are found by paleontologists, maybe one day one will find a fossil of you

From: Waqar Moghul * A mature answer would be: The Blue- Jay is a particular species of bird

They are important because they provide us information like:

How tall it was

What it might have looked like

What it ate

etc.

~kkid2010, Roblox.com and wassuploser14, YouTube.com.

A rock is combinations of minerals and either has to be an igneous, metamorphic, or sedimentary rock.

A mineral is a solid that was formed in nature, has a definite chemical makeup, and has a crystal structure.

Two of the best environments to look for fossils are sedimentary rocks, such as riverbeds and cliffs, and areas with volcanic activity as ash and lava can preserve fossils well. Additionally, coastal regions with eroding cliffs or beaches can also be good places to find fossils.