I have written a book of explanations, the most noticeable are coloured layers which are scuffed at the edges exposing previous layers underneath. Small fossils within the pebble show the pebble has formed around the little critter. Pebbles mounded together clearly show an input of seacrap.
Sunny, calm seashores have sand whilst rough dirty seashores have pebbles. This should be the other way around according to you.
Sand has come onto the shore, not the other way around, sand is our missing landscape from places like the Grand Canyon, where do you think all that missing landscape debris has gone to?
There are too many examples, read the book and I’ll give you a money back guarantee I’m right and science is wrong.