"Bats pop up in the fossil record around a time known as the Eocene. 
Paleontologists have recovered remains ranging from teeth and bits of jaw to stunning full skeletons in places as far-flung as Wyoming, Paris, Australia and India’s Vastan Mine.
Paleontologists have recovered remains ranging from teeth and bits of jaw to stunning full skeletons in places as far-flung as Wyoming, Paris, Australia and India’s Vastan Mine.
A recent study of coloration in the fossil record found that two bats found in Germany were mostly brown.... scientists are left with some big questions. For one thing: The 50-million-year-old bat specimens are already 
recognizable as bats, so where did they come from? When, where, why and how the first bats become airborne is another mystery buried by Deep Time.
The question is where the missing examples of early bats may be found. ....“The short answer is, we don’t know why there is a missing record of ten million years,” says University of Birmingham paleontologist Emily Brown."
RileyBlack/ScientificAmerican
Well, to answer Emily's Curiosity---Bats are NOT missing a record of early examples (of bat evolution) because bats were made bats from the beginning... and are NOT a "Mystery buried by Deep Time" either...And God made the beast of the earth after his kind... Genesis 1:25