David Grinspoon Quote
Yet among the multiple animal inventions at the dawn of the Cambrian were new forms of mobility. A number of critters began burrowing into these mats and braving the toxic soils beneath them. These digging, tunneling creatures are known as bioturbators, basically life that stirs up the ground. In fact, the fossils that officially define the beginning of the Cambrian in the geological record, Trichophycus pedum, are identified by the looping, burrowing patterns they left in the seafloor. Once this bioturbating disturbance of the Cambrian seafloor got started, it began changing the texture and chemistry of the dirt in ways that made it more inviting for other burrowing creatures. Oxygen began penetrating the loosened soil beneath the mats, neutralizing the lethal hydrogen sulfide. This started a positive feedback.
Yet among the multiple animal inventions at the dawn of the Cambrian were new forms of mobility. A number of critters began burrowing into these mats and braving the toxic soils beneath them. These digging, tunneling creatures are known as bioturbators, basically life that stirs up the ground. In fact, the fossils that officially define the beginning of the Cambrian in the geological record, Trichophycus pedum, are identified by the looping, burrowing patterns they left in the seafloor. Once this bioturbating disturbance of the Cambrian seafloor got started, it began changing the texture and chemistry of the dirt in ways that made it more inviting for other burrowing creatures. Oxygen began penetrating the loosened soil beneath the mats, neutralizing the lethal hydrogen sulfide. This started a positive feedback.
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