Which of these geological periods came first?

Question

A) Cretaceous
B)Devonian
C) Silurian
D) Triassic

Answer 1

silurian 444 million years ago
devonian 416 million years ago
triassic 251 million years ago
cretaceous 145.5 million years ago

Answer 2

Paul has it almost right. Each of these periods is a relative age, and each relative period has an absolute age estimate measured in years. Also, each geological period has a "beginning" and an "end" time estimate, and we usually list them from youngest to oldest.

So the correct answer would be:

Cretaceous 65-145 million years ago (Mya)
Triassic 206-245 Mya
Devonian 354-417 Mya
Silurian 417-443 Mya

Note that the absolute age is an estimate determined by the decay rate of radioactive isotopes. Depending on the researcher, there may be some discrepancy on the years.

The short answer to your question is therefore: Silurian came before the other three.

Note that the earth is about 5.4 billion years old, so even the Silurian is quite "young" by earth standards. Over 90% of geologic time occurred before the Silurian!

Answer 3

Silurian becuse it came before Devonian period and the other two took place during the time of the dinosaurs- Mesozoic Era which is earlier. Around 225-65 billion years ago.

Answer 4

Silurian

Answer 5

C) Silurian

Answer 6

silurian,devonian,triassic,cretaceous. Silurian being 400mya+ ago, cretaceous around 150mya

Answer 7

The correct answer is C silurian,

Answer 8

of the ones detailed the answer is the silurian, but it did not come first.That was the pre cambrian.

Answer 9

the silurian period about 443.7 million years ago

Answer 10

I don't look into past think about present or future.