OK, ets use our powers of close observation.
1..You see a lot of sand grains that appar to be pretty unifom in size and (if you look at it under a 50 XPower scope) you should try to see whether the little pieces of cemented sand are rounded or angular
2 Then, when you look at it on edge (Your last picture) you see there are 3 distinct times recorded in the rocks makup
AQ. The red sndy stuff seems to have been laid down in a medium (You have to look closr to see whether its in a wind or water medium) I think its water.
3The color o the reddish sand grains indicates it was laid down in a terrestrial environment.
4 Then the "top" of the red layer appears to have been eroded a bit you can see the , sort of, "ripply patterns" on the top
5 Then, on top of that, is a new (Later" layer of sandy material that is gray (probably underwater slide or submerging area near a tidal or marine zone).
The story is really interesting and would make a neat sedimentary sample for teaching if you cut the sample on its cross section so w could see these structures and be able to read its story.
A geologist would use those observations to help locate the deposition environment and trace it to its sources area (Resources are associate with specific environments
SO, if its composed of grains and appears to be sedimentary, what do you think it would be called?
Perhaps all of the above?
As far as grain sizes and statistics, youre going to have to do that yourself.