evolution and the extinction of dinos

Geological evidence for ice ages comes in various forms, including rock scouring and scratching, glacial moraines, drumlins, valley cutting, and the deposition of till or tillites and glacial erratics. Successive glaciations tend to distort and erase the geological evidence, making it difficult to interpret. Furthermore, this evidence was difficult to date exactly; early theories assumed that the glacials were short compared to the long interglacials. The advent of sediment and ice cores revealed the true situation: glacials are long, interglacials short. It took some time for the current theory to be worked out.The chemical evidence mainly consists of variations in the ratios of isotopes in fossils present in sediments and sedimentary rocks and ocean sediment cores. For the most recent glacial periods ice cores provide climate proxies from their ice, and atmospheric samples from included bubbles of air. Because water containing heavier isotopes has a higher heat of evaporation, its proportion decreases with colder conditions. This allows a temperature record to be constructed. However, this evidence can be confounded by other factors recorded by isotope ratios.The paleontological evidence consists of changes in the geographical distribution of fossils. During a glacial period cold-adapted organisms spread into lower latitudes, and organisms that prefer warmer conditions become extinct or are squeezed into lower latitudes. This evidence is also difficult to interpret because it requires (1) sequences of sediments covering a long period of time, over a wide range of latitudes and which are easily correlated; (2) ancient organisms which survive for several million years without change and whose temperature preferences are easily diagnosed; and (3) the finding of the relevant fossils.Despite the difficulties, analyses of ice core and ocean sediment coreshas shown periods of glacials and interglacials over the past few million years. These also confirm the linkage between ice ages and continental crust phenomena such as glacial moraines, drumlins, and glacial erratics. Hence the continental crust phenomena are accepted as good evidence of earlier ice ages when they are found in layers created much earlier than the time range for which ice cores and ocean sediment cores are available.

The fauna below the k-t line or as this creationist sees it the flood line is exactly what one should expect to find.

before the flood there was no rabbits but simply the rabbit was of a kind that isn't recognized or found in the record. And so on.

No. The only way to have fossilization is from great mechanisms.
So by the time of the great post flood fossilization event the dinos had vanished. unless some simply adapted a bit and were the later creatures but not recognized. this is another option.
I see the dinos and others as part of the unclean group and since the ark was a ratio of surviving clean/unclean 12:2 then it fits nicely to see the complete post flood overthrow of the old unclean dominance before the flood.
There are no actual dino creature group. there are just kinds. simply like mammals or reptiles kinds tend to have like features for like needs. So there were the kinds that today they call dinos on the ark.

I say seals are just bears.