According to research the rock cycle is continuous and never ending. Based on this fact it would seem almost silly to find an abundance of Precambrian rocks. Rocks found on the surface today are fairly recent relative to Precambrian rocks. The reason for the absence of these ancient rocks is merely because of the rock cycle. So a Precambrian rock found today would have most likely gone through the rock cycle thousands of times. Also if a person were to find a true Precambrian rock, it would be almost impossible to truly call it one because of the numerous rock cycles it would have had to under gone. Now that is not to say that Precambrian rocks do not exist today, because they do, but one must assume that the rock has under gone numerous rocks cycles. The odds of a Precambrian rock being preserved is extremely low almost of a zero percent chance of it happening. This is because of the extreme number of years that have gone by since the rock was first created. Even then the rock that would have been newly formed would not be brand new. That same rock probably also went through a few rock cycles.
Say the rock was sedimentary, it would have had to under gone constant compaction, and pressure. It would start to gain other rocks to add on to it and eventually change into a metamorphic rock which is formed under extreme heat and pressure. Heat and pressure go together. Pressure causes heat and heat causes pressure. Enough heat and the rock begins to liquify thus forming an igneous rock. The rock could be shot up into the sky from a valcano, land on the ground, cool, then harden. Then the natural elements would take control and weather the rock down into a sedimentary rock, restarting the cycle all over.
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