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Geologic time is the immense span of time that has elapsed since Earth first formed- almost 5.5 billion years ago-to recent times. The geologic time scale is a way of putting Earth’s vast history into an orderly fashion, giving a better perspective of events. At the turn of the nineteenth century, William Smith, an English Canal Engineer, proposed that the lowest rocks in a cliff or quarry are the oldest, while the highest are the youngest.

By observing fossils and rock type in the various layers, it was possible to correlate the rocks at one location with those at other location. These finding along with the first discoveries of dinosaur fossils, led to a framework that scientist still use today to divide Earth’s long history into geologic time scales.

What are the geologic time scales?

The table below is a listing of the geologic time table based on current interpretations of rocks and fossils:

When you have to determine if a fossil is genuine, plenty of tests like acid tests, X-rays, and radiometric dating could be performed. But for a fossil collector getting hands-on such expensive techniques is next to impossible and cost prohibitive. So what should you do, when you need to know whether a fossil you are about to buy is authentic or not? To help you out, here we have mentioned a few tips to go through:

Ever wondered why shark teeth are not mainly white but colored? From brown to dark gray, you will find different colors but hardly a white preserved tooth. If you believe it has got something to do with the age of a fossil or its type, the answer is unfortunately a big NO. A fossilized tooth of an extinct shark gets the color from the type of deposit in which it had been preserved all these years. To understand it in a better way, let’s just take a quick look at how a shark tooth gets fossilized first.

At any given time, a great white may have up to three thousand teeth in its five rows. The front row is probably the largest and strongest one. This row is used to bite and tear meat. In its lifetime, it can grow and use near about 20,000. One of the amazing things about great white is they never run out of teeth. When they lose one, another spins forward from the backup or reservoir in the jaw. This tooth replaces the old one and again, there is a strong row of teeth ready to snare small fish species.

The great white shark is the largest predator of the ocean, having thousands of sharp teeth that facilitates its role as a hunter under the water. If you want to feel the presence of this great fish, buy one fossilized tooth today.

If we start thinking about dinosaurs from our perspective in the 21^st century, they are terrifying and bizarre, in fact, dinosaurs were really intimidating. You may have seen their replicas in museums and research centers. If you want to see their power, shape and ability, watch “Jurassic Park” series. Most of us think that there were some freakish dinosaurs during the Triassic, Jurassic and Cretaceous period.

The first dinosaur fossil was found in the 19^th century. Since then, they have become an enduring part of world culture, even; you can find dinosaur teeth for sale at many online stores. Here, we have a list of five freaking dinosaurs whose skeleton have not been found as of 2014.

Today, trilobites exist only in the form of fossil. It is classified as a form of early arthropod. When we talk about Paleozoic era, it represents a geographical time period having a few characteristics. This time period sets it apart from others. In the Paleozoic period, life exploded into animal form marking the beginning of this era. It was an era in the Cambrian period and the prolific arthropod became the signpost for the era. If you take a close look at the trilobites, it reveals certain familiarity with modern-day species known to us.