While fossils exist and can provide for us evidence for the ToE, it cannot go further back because there is no physical evident for what existed BEFORE the fossils. All the ideas on what conditions existed on the Earth to support the evolution of life are mere speculation. Evolutionists are forced to use words like "must have been", "conditions favorable to the development of life", "probably", ad nauseum. What they are forced to do is recreate the conditions that they think must have been needed for life to develop.
All the ideas on what conditions existed on the Earth to support the evolution of life are mere speculation.
There are indeed some records from geological processes. However, being able to tell exact dates is suspect.
It's my opinion that all reasonable theories concerning the origin of life should be taught in schools, however, they should be confined to philosophy classes.