Stromatolite Fossil Algae Bolivia Cretaceous - FSE220 ✔100% Genuine ✔UK Seller For Sale

Stromatolite Fossil Algae Bolivia Cretaceous - FSE220 ✔100% Genuine ✔UK Seller

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Stromatolite Fossil Algae Bolivia Cretaceous - FSE220 ✔100% Genuine ✔UK Seller:

All of our Fossils are100% Genuine Specimens & come with a Certificate of Authenticity

Name: Stromatolite

Species: Algae

Age: Cretaceous

Location: Bolivia

Size:26 x 18 x 20mm (1.02 x 0.71 x 0.79 inches)

Stromatolitesare layered bio-chemical accretionary structures [algea] formed in shallow water by the trapping, binding and cementation of sedimentary grains by biofilms of micro-organisms. This Cretaceous aged specimen is 'relatively' young, considering the Stromatolites from the Strelley Pool Formation,found in Australia,are dated to more than3.5 billion years oldand classed as the oldest fossil to date! This formation is within the Pilbara Supergroup and an extremely important site for scientists to study.

**The photo shows the actual specimen you will receive**

**NB: This picture will change once we update the listing after this specific item has been sold, this action may cause the picture in your purchase history to also change to the new image! We would suggest saving/screenshotting the item image as soon as purchased for your own records of comparison for once the item has been received in the post. We also keep a record of every image we upload**

What is a fossil?

The word Fossil used to be defined as ‘something dug up’. Now-a-days it generally means ‘The remains or trace evidence of prehistoric life’. The study of fossils is called palaeontology; someone who collects and studies them is called a palaeontologists. Fossils can be as tiny as a grain of pollen or a seed for e.g. or as huge as a limb bone from a giant dinosaur. For animal or plant remains to have become ‘fossilised ‘, they must go through a certain process that preserves them for up to millions of years after they have died. Usually it is only the hard parts of plants and animals that survive this long process.

How Fossils Formed

The most common method of how fossils formed is once an animal or plant dies it falls to the ground,then is covered by sediment. This is often sediments brought from water. In the diagram above, the Ammonite died in a river, and sediments over time covered the ammonite (shown in the second diagram). Finally after hundreds of thousands, or millions of years, the land is eroded and the fossil can be seen. Of the vast amount of prehistoric life that died, it is only a tiny amount that has survived the fossilisation process. The conditions when the majority of life died were just not right at that time to preserve them. Most fossils are found in sedimentary rocks which were formed from the sediments of rivers, lakes and seas. The majority of the animal and plant fossils we find today had originally died near these areas, got broken up and deposited on the beds of the rivers, lakes and seas. The sediments covered them and over time some of the layers grew so thick that many of them got crushed. The sediments compacted and over time and turned to rock. The rocks shifted, moved and became exposed to the elements. This process can take up to several hundred million years. Now as the rocks erode or are quarried for example, the fossils become exposed and can be collected. The Best conditions for Fossilisation 1. The quick burial of animal remains in moist sediments. This prevents scavengers from eating and bacteria from decaying them. 2. The quick burial in volcanic ash. Many dinosaur bones in the American west have been found buried in volcanic ash. 3. The presence of hard body or plant parts, teeth, bones, shell and wood for example. 4. Unchanging temperature conditions. 5. Ground water that is heavily mineralised. 6. Sediments that are very fine make a better burial than coarser gravels. 7. Calm conditions, so that remains are not broken up (by wave or currant action for example)

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