The idea is an interesting one but it seems too complecated, the simplest answer is usually the correct one. First off for a race that advanced it would take tens or hundreds of thousands of years for all traces to dissapear. Plus it wouldn't be possible for a race to advance past what we would consider 18th century tech. As much as we have grown to hate them we have them to thank for the past 200 years of advancment, and the massive stores of oil, natural gas, and coal we have today just would not have existed than, they were just being created. Technaclly we're burning Littlefoot and co in our cars everyday (sad
I know, also not a 100% factual but the fossile fuels still wouldn't have exsited)
I am interested to see you pointing out possible flaws with my theory, flaws that I will, obviously, try to disprove. (Yes, I have pointed out multiple times that my theory is quite complicated, but if you take the time to understand the facts, it can make sense.)
First, the time required. The age of the dinosaurs lasted well over
100 million years, and since we have no idea when the events of LBT occur, this is more than enough time to allow my theory to be plausible.
Second, I am well aware of the necessity of fossil fuels to allow an advanced civilization to develop. Geology is among the somewhat interesting topics to me, and from it I know that most of today's fossil fuels formed during the Carboniferous period, which was no less than 100 million years
before the age of the dinosaurs. This means they might not have as much available as we do, but likely enough to get by.