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Carboniferous Crossword

Across
An abundance of this substance within Earth's oceans likely caused the extinction of 6-Down
This orogeny began during the Carboniferous
The first sub-period of the Carboniferous, named after a US state
During this time period, these were extensive and helped form coal
This semi-aquatic class was abundant during the Carboniferous
The earliest members of this scaly class existed during the Carboniferous
Down
Many plants of this period were this, or able to transfer fluids through the body
North America slammed into this continent, causing 5-Down and forming Pangaea
The second sub-period of the Carboniferous, named after a US state
Aquatic species that most notably went extinct during this time period
This landmass, along with Gondwanaland, formed Pangaea