Refers to a specific time in Earth's history when extensive coal deposits formed.

Geologic Era

Used in geology and paleontology, not in everyday conversation.

Technical Term

Indicates something very old, not relating to current times.

Not Present Day

 reserves of natural gas kind of exploded and the price plummeted which which made wind and uncompetitive in a nutshell that's what happened that's that's what happened we found out that we could go to the source rock which were the carboniferous shales in the basin's

Let's transform energy...

 and the price plummeted, which made wind uncompetitive. In a nutshell that's what happened? That's what happened. We found out that we could go to the source rock, which were the carboniferous shales in the basins.

Carboniferous