Earth Science Focus - Fossils
My son and husband love fossils, more specifically they love science. Just this morning I had to show my son how chocolate is made and after that he began asking questions about fossils so since we are visiting my parents we will be going out walking later this afternoon, in search of fossils.
Today we are going to learn more about fossils and creating our own,
What is a fossil?
Fossils are the remains of ancient organisms as well as traces. of them. Most scientist work on the fact that a fossil must predate the recorded human history, this typically means that something must be older than 10 000 years to be considered being a fossil.
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How are fossils created?
Fossils can be formed in different ways. Most of them are formed when a plant or animal dies in a watery environment and is then buried in mud and silt. The soft tissues then quickly decompose and then leaves the hard bones or the shells. When the sediment builds up over time over the top, it then hardens into rock. Petrification then occurs. This means that the encased bones start to decay; The minerals then seep in to replace the organic material cell by cell. Sometimes the bones completely decay, which then means that it leaves a cast of the organism. The void that is left behind is then filled with minerals that makes a stone replica of the organism.
Types of fossils
There are four types of fossils
1. Mold fossils
The mold fossil is a fossilized impression made in the substrate, it creates a negative image of the organism.
2. Cast fossils
The cast fossils are created when a mold is filled in.
3. Vtrace fossils = ichnofossils
The Vtrace fossils are fossilized nests, gastroliths, burrows, footprints, etc.
4. True form fossils (fossils of the actual animal or animal part).
Video about the four types of fossils
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Fossil experiment
You will need the following
- Toy dinosaurs
- A small cup of instant coffee
- 3/4 cup cold water
- 1 cup flour
- 6 tbsps of salt
- A baking tray
- Baking paper.
Instructions
- Mix the instant coffee, flour, salt, and water together to make a dough.
- Make sure that the dough is wet, but not that wet that it sticks to your fingers.
- You can either measure out or guess the amount of dough needed for a dinosaur footprint or body print.
- Line your baking tray with baking paper.
- Place the dough on the tray and flatten it on your palm.
- Now you take your dinosaur and press it softly into the dough. Just enough so that it makes an imprint in the dough.
- Bake your fossil at a low heat of about 150C for a few hours, might range between 2-4 hours. Just keep a close eye on it.
- Now remove the "fossil" from the oven and let them cool. They will harden more while they cool.
Video for kids about fossils
Sources
Created by Giphy
