ALL the fossils you have ever seen are one layer (except polystrate fossils)
Glad you mention chalk, so we can go ahead and kill two birds with one stone...
The Acrocanthosaurus dinosaur fossil and the Lepidodendron plant fossil are polystrates in the Austin Chalk/Glen Rose Cretaceous sedimentary limestone formation that literally extends to every continent on Earth. This observation is documented in The Nature of the Stratagraphic Record and
The New Catastrophism by evolutionist Derick Ager.
So either your belief of more than one layer is flawed, or your belief in how long geological process take (such as chalk) is flawed. In reality both are....
View attachment 244685
Here's an example of one that starts in a coal bed, extends up through several layers, and ends in another coal bed.....
coal
"Fossil fuels are formed from the remains of ancient organisms. Because coal takes millions of years to develop and there is a limited amount of it, it is a nonrenewable resource"
And why is it a nonrenewable resource? Because it never develops today, nor are there any indications by "your" calculations that any has begun forming despite Billions of years passing... which means there should be coal deposits all over the world in various stages of formation....
It is nonrenewable because God promised never to create another world-wide flood.... what caused all that plant material to be brought together in the first place in masses 2,000 feet thick which would be required to form some of the deposits we see today......