Your time spent researching the Morrison Formation must not have amounted to diddly squat.
Here is a description of the Morrison Formation.
"The Morrison Formation is a distinctive sequence of Late Jurassic sedimentary rock that is found in the western United States..."
"It covers an area of 1.5 million square km (600,000 square miles), although only a tiny fraction is exposed and accessible to geologists and paleontologists. Over 75% is still buried under the prairie to the east and much of the rest was destroyed by erosion as the Rocky Mountains rose to the west."
"According to radiometric dating, the Morrison Formation dates from 156.3 ± 2 million years old (Ma) at its base,[2] to 146.8 ± 1 million years old at the top.."
http://en.wikipedia.org/wiki/Morrison_Formation
Trilobites disappeared in the mass extinction at the end of the Permian about 250 million years ago, so they were extinct for about 100 million years when the Morrison Formation was laid down.
http://en.wikipedia.org/wiki/Trilobite
And the only dinosaur fossil that you mentioned that was found in the Morrison Formation is that of the allosaurus. All of the tyrannosaurus genera lived near the end of the Cretaceous Period several tens of millions of years after the Morrison Formation was laid down.
So your research didn't amount to diddly squat.
Only about one thousandth of one percent of the dinosaurs that ever lived were buried sufficiently soon after their death to be preserved as fossils. But since there were billions of dinosaurs that lived over a period of 150 million years, that still comes out to quite a few fossils.
In the first place, if it had occurred, the biblical flood would not have left all of the different kinds of layered strata, many of which are interwoven with entirely different methods of deposition, not all of them water related.
Furthermore, if the biblical flood had occurred, you would find fossils of the approximately 5,000 present-day species of mammals, including humans, and of the approximately 10,000 present-day species of birds, mixed in with the fossils of, for example, dinosaurs. You do not and will never find such a mixture. That is because they are separated in time by more than 60 million years and the fossil record reflects that fact. The only fossils of mammals and birds that are found in the same strata as dinosaurs are early types quite unlike anything that exists today (even if you consider the "kinds" that creationists refer to as the source of present-day mammals and birds). And you will also not find those fossils of present-day mammals and birds in the same strata with trilobites, or of numerous other early types of animals.
In the Cambrian strata, which was laid down long before the time of the dinosaurs, you will find the initial appearance of most of the phyla, but they will be only very primitive species--none of which exist today--belonging to those phyla. You will not find one single amphibian, reptile, dinosaur, bird, mammal, or teleost fish.
And that scenario even continues after the demise of the dinosaurs. As you progress through the strata you will find new forms, but still nothing like what you would find today until you get to relatively young strata. There are numerous strata which show that mammals became predominate for several tens of millions of years on up to today. But the strata that was laid down during the first half of that time contains a large number of fossils of mammals quite unlike anything that exists today, and again, none of the fossils are of present-day mammals, including humans, and present-day birds. As those strata get progressively younger, you begin to see more and more fossils of mammals and birds that are similar to the present-day species. That includes hominid fossils, which are present only in the strata laid down in the past few million years. Hominid fossils are totally absent in the vast number of earlier fossil-containing strata.
Note the appearance of types of organisms over time in these tables:
http://en.wikipedia.org/wiki/List_of_transitional_fossils
http://en.wikipedia.org/wiki/Geologic_time_scale#Table_of_geologic_time
Thus, if you look at the geological strata, you will find a changing representation of species through the oldest to the youngest strata, and those changes reflect an evolutionary process. That is not what you would find if the fossil record had been laid down by a flood such as that described in the Bible. But it is what would be expected in an evolutionary scenario.
Added:
And @Bloodhound presents a bunch of statements that have absolutely no basis whatsoever in reality.