McPherson described "E. tribuloides" as a "sluggish echinoid" that leads a nocturnal, benthic existence. Micraster was an infaunal echinoid living in a burrow below the sediment surface. Melonites is genus of echinoid from Palaechinidae family. The sparse fossils found in this sequence include the brachiopod "Terebratulina" and the echinoid "Conulus". Larval life span of the echinoid "Evechinus chloroticus" (VAL.). Fossils which may be seen in the limestone scree are bivalve, brachipod and echinoid. Although the rate of movement was slow, it was sufficiently fast to outpace the echinoid. One echinoid, "Mellita granti", is a sea urchin endemic to the Gulf of California.