They are found mainly in arid environments although some aeolian lakes are relict landforms indicative of arid paleoclimates. |
As such, they have been found fossilized in Jurassic and Cretaceous deposits, and have been used to reconstruct paleoclimates. |
The origin of the Brejos has been associated with humid paleoclimates established after the middle Tertiary, especially during interglacial phases of the Pleistocene. |