New evidence for the age of lower part of the Palomas Formation, Truth or Consequences, New Mexico
— Charles A. Repenning and Steven R. May

The Truth or Consequences fauna is from normally magnetized deposits in the lower part of the Palomas Formation that are exposed in a roadcut along 1-25 just west of the city. The fauna contains nine identified mammals and four reptiles. The mammals are comparable to, but somewhat more primitive than, those known from the Rexroad 3 fauna of Kansas. The reptiles, however, are known only from more southerly faunas and probably reflect the lower latitude of Truth or Consequences, Consideration of similar faunas with known paleomagnetic constraints leads to the conclusion that the fauna was deposited during the Nunivak Normal Paleomagnetic Subchron between 4.05 and 4.20 my ago.