Can it be "Pre-Torah" or "Pre-Oral Torah"? The next person in line after Abel, Seth, is Noah, to make a connection with the sacrificial offerings, when Noah got off the ark, Genesis 8:20-21. How did Noah distinguish between clean and unclean animals? At this point the animals on the Ark must have been endangered species, right? Was Noah in the ark for 370 days? Were the sacrificial offerings that Noah made to God clean animals? Was there such thing as Kosher food before Moses and Sinai?     
Leviticus 11:3-8
Deuteronomy 14:4-8