Trilobites
What Era did Trilobites live in?
What is Paleozoic era
What is a fossil that shows an organism's activity (like tracks) rather than its body?
What is Trace fossil
Where is the oldest rock layer found?
What is At the bottom
How many lobes does a Trilobite's body have?
What is Three
To protect themselves from predators, some Trilobites could roll into a ball, similar to what modern-day bug?
What is Pill bug or roly-poly
During which period did Trilobites live in?
What is Cambrian Period
Why are Trilobites considered "index fossils"
What is a gap in the geologic record called?
What is An unconformity
What are the three main body sections of a Trilobite?
What is Cephalon (The head), Thorax (The middle), Pygidium (The tail)
Most Trilobites were benthic meaning they lived in what part of the ocean?
What is The bottom (Ocean floor)
What type of environment did Trilobites live in?
What is Marine (Oceans)
What is an impression left in sediment called?
What is A mold fossil
What is the largest division of geologic time?
What was the Trilobite's hard outer shell called?
What is Exoskeletion
What did Trilobites use instead of teeth or fangs to break up their food?
What is Spines on their legs (Called gnathobases)
When did Trilobites go extinct?
What is The end of the Permian Period ( The Great Dying)
What do we call the process where minerals replace organic material?
What is Petrifaction or Permineralizaton
Which era is known as the "Age of Reptiles"?
What is Mesozoic
What unique material were Trilobite eyes often made of?
What is Calcite (Crystal)
While they are not direct descendants, what modern marine animal is considered the Trilobite's closest living relative?
What is The horseshoe crab
What phylum did Trilobites belong to?
What is Arthropoda
What can the presence of a marine fossils on a mountain tell us?
What is The land was once water
What principle states that geologic processes today are the same as in the past?
What is Uniformitarianism
How did Trilobites grow larger?
What is Molting ( shedding their shells)
Some Trilobites were "pelagic", which means they didn't crawl on the bottom but what instead?
What is Floated or Sam in the open water