Carboniferous Crossword
This printable crossword puzzle on the topic of Rocks & Minerals has 11 clues. Answers range from 4 to 13 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.
Description
An abundance of this in Earth's oceans likely caused the extinction of 9-Across
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
Many plants of the period were this, able to transfer fluids through the body
North America slammed into this continent, causing 6-Across 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
