Comanchean

From Comanche (“a city in Texas”) +‎ -ean.

Comanchean

1. A period of the Mesozoic era, between the Jurassic and the Upper Cretaceous periods, lasting from 145–100.5 millions of years ago.

   Synonyms: Early Cretaceous, Lower Cretaceous

   • [1911, “Cretaceous System”, in Encyclopædia Britannica, 11th edition, volume 7, New York, N.Y.: Encyclopædia Britannica, Inc., page 415:

     There is a very general unconformity and break between the Lower and Upper Cretaceous; this has led Chamberlin and Salisbury to suggest that the Lower Cretaceous should be regarded as a separate period with the title "Comanchean."]

• “Comanchean”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “Comanchean”, in Collins English Dictionary.