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What were a group of hard-shelled animals that lived 65 million to 500 million years ago and are used as index fossils?
The group of hard-shelled animals you are referring to is likely trilobites. These marine arthropods thrived between approximately 500 million and 250 million years ago, with a peak diversity during the Cambrian and Ordovician periods. Due to their widespread presence and rapid evolutionary changes, trilobites are commonly used as index fossils to help date and correlate rock layers in the fossil record.
What else can I help you with?
All about dinousrs?
Dinosaurs were a group of large vertebrates that were alive over 200 million years ago. Fossils of these animals have been found all over the world.
What group are fossils never found in?
Fossils are never found in Igneous rocks
Were there dinosaurs in the olden times?
There were dinosaurs up until about 60 million years ago. They had existed for about 170 million years. The present representatives of this group of animals are the birds.
What group of rocks come from living things?
Fossils!
Are fossil fuels fossils?
Yes. They are a large group of fossils which are full of the energy of the dead creatures or plants which formed them.
Which group of rocks tends to have fossils?
Sedimentary, especially limestone.
What was the first group of muscled animals?
The first group of muscled animals were likely jawless fishes, which evolved around 500 million years ago. These early vertebrates had simple muscle structures that allowed them to swim and move efficiently in water.
Dinosaur lived for how many years on earth?
Dinosaurs are a diverse group of animals that were the dominant terrestrial vertebrates for over 160 million years.! :)Thank you.
What is a patch of animals?
a group of animals
What is the least diverse group of animals?
The least diverse group of animals is Insects.
What group of animals is called a siege?
The groupe of animals known as siege is called Heron.
What group of animals called Kindle?
What group of animals are in a kindle? What group of animals are in a nide?
