To be honest, I don't think there are any well-thought-out creationist answers. At least, none that I have heard that stand up to scrutiny. You will hear that the layering of fossils observed in the fossil record follow differential sorting during the Flood, organisms having been deposited according to mass, buoyancy, density, etc. But such appologetics do not explain, for expample, the appearance of fish throughout virtually the entire fossil record, and dinosaurs only within Mesozoic strata.
In any case, you're still young, RichardT, and I pray that you keep the faith regardless of which camp you fall in.
And for what it's worth, dinosaurs aren't the only creatures relegated to specific strata. The same holds for trilobites, pterosaurs, humans, mosasaurs, rugose corals, etc.