Various attempts have been made to refine the Udden Wentworth scale, including its definition of cobbles.
2.
Gravel is categorized by the Udden-Wentworth scale into granular gravel ( ) and pebble gravel ( ).
3.
In the late 1800s and early to mid-1900s, prior to the Udden Wentworth scale's widespread adoption, size classifications tended to group all particles larger than together as " gravel " or " stones ".
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