Yes, but the fact is, most of the creatures who have lived on earth are NOT preserved in the fossil record. Only a fraction get fossilized. So we thought it would be fun to propose that at least one higher, more complex animal, with a very unusual life cycle, arose in the Precambrian and was lost to history until Tremors 2. If you’d like an alternate theory, at one time there was on the SciFi Tremors series website a much more detailed and scholarly analysis of where in pre-history Graboids may have arisen (the writer proposed that Kate White was mistaken in her original judgment about the Precambrian origins).
On a side note, one thing that is definite is Graboids and their two metamorphic forms were NOT the result of the compound Mixmaster being released into the Perfection Valley environment (revealed in Tremors, the Series). Graboids predated that event by hundreds, if not thousands of years.
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