Key Evidence for Continental Drift

Evidence from Rock Formations

• Wegener proposed that as Pangaea broke apart, similar geologic structures (e.g. mountains) became separated.
• Geologists found areas with identical rock types on opposite sides of the Atlantic Ocean (e.g., volcanic eruptions in Africa and South America).
• Rocks studied are similar in chemistry and age, suggesting they were formed during the same geological period.

Fossil Evidence of Continental Movement

• Unique species (e.g. lions in Africa, kangaroos in Australia) illustrate that continents are isolated.
• Fossils of similar organisms found on separate continents support the idea of continental drift.
• Fossil remains help reconstruct ancient landmasses, specifically Gondwana.

Coal Deposits as Evidence

• Coal deposits discovered in Antarctica indicate past warm, tropical climates.
• Presence of coal suggests Antarctica was previously located closer to the equator.

Fossil Similarities Across Continents

• Fossils such as Glossopteris found on multiple continents (South America, Africa, India, Australia, Antarctica).
• Fossil locations suggest these continents were once connected due to climate similarities.
• Fossils from reptiles (e.g. Mesosaurus, Cynognathus, Lystrosaurus) found across oceans indicate these species could not have crossed the vast water bodies now separating continents.