Too many descriptors "might", "may have", "could", "believed to be" and the like keep such conclusions at best in the science hypothesis stage. This issue isn't really lose to that level. They have come up with a guess. Most evolutionist declarations contain too much speculation, too little definitive science-method proof of many claims. Instead of reading between the lines they tend to fill in between the lines of actual information. They must guess at most of it because they are trapped in the present, can't visit back to observe actual facts. Next comes testing by competitive labs. Discrepancies then must be worked together, usually cancelling out the first conclusion. Even if lab operations over a century are conducted, there is no way to simulate preservation over a million years, much less 60 millions of years.
There are many embarrassing "discoveries" among evolutionists. They are adept at taking a fossil feather that grows into a tale about a giant dinosaur evolving into modern day chickens, when the feather was actually only a mineral dendrite. It's those "might have" words that ultimately ruin the science that actually got off to a good start. I have a nice collection of dendrites, most being flat mineral patterns resembling ferns, but those are just the way the mineral molecules crystallized in a crack between rock layers. My favorite is a a dendrite/phantom inside a clear quartz crystal that looks like a climbing rose vine, complete with 'leaves' and a few red 'roses'. Poor science would be to conclude the quartz crystal formed around a live rose. That's what everyone that has handled it has guessed. But due to the high temperature needed (melt lead) for quartz crystals to form, there would be no trace of a plant inside it. The dendrite is but a pretty defect, like a flaw (nitrogen chamber) in a clear diamond improves it's beauty.
Beware of science statements based on guesses . School science textbooks are still filled with guesses, speculation, and outright deceptions, all in the name of trying to convey science ideas to students on their level of comprehension. The more they guess, the more they discourage people from believing any of the Bible is true. They did that to me in the 1950's-1960's pursuing a geology education, but God saved me in my thirties from influence of atheists and agnostics, as well as confused Christians.