Fossil : the shape of a bone, a shell, or a plant or animal that has been preserved in rock for a very long period
Noun Chitinozoans and a few graptolites were found in the unit, but no other fossils.
Dinosaur :a type of reptile that became extinct about 65,000,000 years ago. There were many different types of dinosaur, some of which were extremely large.
Noun This computer's a dinosaur, isn't it?
Amber : a hard, transparent, yellowish-brown substance that was formed in ancient times from resin (= a substance produced by trees) and is used in jewellery
Noun He has a collection of prehistoric insects preserved in amber.
Mud : a substance that consists of very small grains of rock, found on beaches and in deserts
Noun a grain of sand
Mold : a soft green, gray, or black growth that develops on old food or on objects that have been left too long in warm, slightly wet places
Noun , verb She molded the clay into little animals.
Tar : a black substance, sticky when hot, used especially for making roads
Noun a low tar cigarette
Sponge : a soft substance that is full of small holes and can absorb a lot of liquid, and is used for washing and cleaning
Noun Give it a sponge with a damp cloth - that will remove the blood stains.
Horseshoe : a U-shaped piece of metal that is attached to the bottom of a horse's hoof to protect it
Noun For many people the horseshoe is a symbol of good luck.
Preserved : to keep something as it is, especially in order to prevent it from decaying or being damaged or destroyed
Verb to preserve the environment
Fish : an animal that lives in water, is covered with scales, and breathes by taking water in through its mouth, or the flesh of these animals eaten as food
Noun Several large fish live in the pond.
Mud : earth that has been mixed with water
Noun The vehicles got bogged down in the heavy mud.
Trace : to find someone or something that was lost
Verb The police are trying to trace the mother of a newborn baby found abandoned outside a hospital.
Crab : a sea creature with five pairs of legs and a round, flat body covered by a shell, or its flesh eaten as food
Noun We walked along the beach collecting small crabs
Mineral : a valuable or useful chemical substance that is formed naturally in the ground
Noun A healthy diet should supply all necessary vitamins and minerals.
Footprint : the mark made by a person's or animal's foot
Noun The new computer has a smaller footprint.
Sediment : a soft substance that is like a wet powder and consists of very small pieces of a solid material that have fallen to the bottom of a liquid
Noun There was a brown sediment in the bottom of the bottle.
Carbon : a chemical element that exists in its pure form as diamond or graphite, and is an important part of other substances such as coal and oil, as well as being contained in all plants and animals
Noun They used carbon dating tests to authenticate the claim that the skeleton was 2 million years old.
Inpression : an idea or opinion of what something or someone is like
Noun I didn't get much of an impression of the place because it was dark when we drove through it.
Cast : the actors in a film, play, or show
Noun After the final performance the director threw a party for the cast.
Trilobite : a simple, flat sea creature that lived in the earliest period of life on earth, with a hard outer layer and a body in three parts
Noun Distribution of trilobites within these formations is random, and boundaries between the lithostratigraphic units are typically not exposed.