• The name given by Sir Roderick Murchison to a vast series of fossiliferous strata, which lies between the non-fossiliferous slaty schists below and the old red sandstone above. The system is well developed in the region of Shropshire, etc. , once inhabited by the Silures under Caractacus, or Caradoc. —⁠ Tr. ↩
• The name of an Ethiopian tribe who lived in caves and holes. Τρώγλη , a hole, and δύω , to creep into. ↩
• One hundred and twenty. —⁠ Tr. ↩
• These animals belonged to a late geological period, the Pliocene, just before the glacial epoch, and therefore could have no connection with the Carboniferous vegetation. —⁠ Tr. ↩
• This distance carries the travellers as far as under the Pyrénées if the league measures three miles. —⁠ Tr. ↩
• Rather of the mammoth and the mastodon. —⁠ Tr. ↩
• The glyptodon and armadillo are mammalian; the tortoise is a chelonian, a reptile, distinct classes of the animal kingdom; therefore the latter cannot be a representative of the former. —⁠ Tr. ↩