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Devonian to cretaceous is the the geological age of ammonoids They first appeared during the Devonian Period (approximately 410 million years ago). They almost died out at the end of the Permian Period (251 million years ago), and again at the end of the Triassic Period (205 million years ago). They finally became extinct at the end of the Cretaceous Period (65 million years ago), perhaps as a result of a lowering of ocean levels.
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What is a ammonite fossil called?
Ammonites are the most widely-known and abundant fossils in the world. The name "ammonites" came from the Greek god Ammon. Ammonites include squid, octopus, snails, cuttlefish, and nautilus.
What three features must a fossil have in order to be an index fossil?
* the organism must be common in rocks from most of the world *the organism must have lived for only a geologically short period of time( a few million years to a few hundred million years) *the organism must be easy to identify.(trilobites and ammonites are 2 kinds of organisms that are used as index fossils).
What is the relationship between frequency and period?
Time period = 1 / frequency. Frequency = 1 / time period.
The time it takes two successive crests of an ocean wave to pass a given point is called a?
A wave length.
Is weather a short period of time or long period of time?
Weather last s mostly long Time for example a snow storm
What time did Ammonites live?
in your fat belly
What period in which the last ammonites became extinct?
Ammonites went extinct at the end of the Cretaceous Period.
Do ammonites live in today's seas?
ammonites are extinct
Where was ammonites dominant?
Ammonites are very common fossils from the Jurassic Period. They were dominant in the ocean during and before the Jurassic Period.
What eon was ammonites introduced?
Ammonites first appeared during the Devonian Period within the Paleozoic Era.
Is ammonites good index fossels?
Yes, ammonites are good index fossils because they had a wide geographical distribution and existed for a long period of time. Their evolution is well-documented, making them useful for relative dating of rock layers.
When did ammonites become extinct?
Ammonites went extinct at the same time as the dinosaurs, about sixty-five million years ago.
What is a pachyceratid?
A pachyceratid is a member of the Pachyceratidae, a family of ammonites from the middle- and upper-Jurassic period.
What time period did iguanodon live in?
Cretaceous period,
What time period did ankylosaurs live?
Cretaceous period
What time period did the Bachipods live in?
Ordovician Period
What type of climate did Ammonites once live in?
in the Mesozoic and Paleozoic era
