I'm not seeing a lot of gravel.
You could put a piece of cloth over it and press the water out with some kind of plunger, and dry it out into a cake and slice it in half.... and probably find out it settled out uniformly.
https://www.thoughtco.com/soil-class...iagram-1441203
Quote:
Defining Soil Particle Size Distribution
Without a microscope, sand, silt, and clay soil particle sizes are impossible to measure directly so sediment testers determine the coarse fractions by separating the size grades with precision sieves and weighing them. For the smaller particles, they use tests based on how fast the different sized grains settle in a column of water.
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Do you have access to a microscope?