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2. Crushed stone - Wikipedia

   en.wikipedia.org/wiki/Crushed_stone

   Crushed stone or angular rock is a form of construction aggregate, typically produced by mining a suitable rock deposit and breaking the removed rock down to the desired size using crushers. It is distinct from naturally occurring gravel , which is produced by natural processes of weathering and erosion and typically has a more rounded shape.

3. Dighton Rock - Wikipedia

   en.wikipedia.org/wiki/Dighton_Rock

   The Dighton Rock is a 40-ton boulder, originally located in the riverbed of the Taunton River at Berkley, Massachusetts (formerly part of the town of Dighton).The rock is noted for its petroglyphs ("primarily lines, geometric shapes, and schematic drawings of people, along with writing, both verified and not."), [2] carved designs of ancient and uncertain origin, and the controversy about ...

4. River gravel - Wikipedia

   en.wikipedia.org/wiki/River_gravel

   River gravel is a name given to gravel composed of small pieces of rounded stone of various colors, usually no larger than a large coin. [1] It is named for the effect of many years of rounding of the edges of the stones due to a flow of water over it, as often takes place in a river . [ 2 ]

5. Erratic Rock State Natural Site - Wikipedia

   en.wikipedia.org/wiki/Erratic_Rock_State_Natural...

   Erratic Rock State Natural Site is a state park in the Willamette Valley of Oregon, United States. Featuring a 40-short-ton (36 t) glacial erratic from the Missoula Floods , the small park sits atop a foothill of the Northern Oregon Coast Range in Yamhill County between Sheridan and McMinnville off Oregon Route 18 .

6. Riprap - Wikipedia

   en.wikipedia.org/wiki/Riprap

   Riprap causes morphological changes in the riverbeds they surround. One such change is the reduction of sediment settlement in the river channel, which can lead to scouring of the river bed as well as coarser sediment particles. This can be combatted by increasing the distance between the pieces of riprap and using a variety of sizes. [7]

7. Indian Head Rock - Wikipedia

   en.wikipedia.org/wiki/Indian_Head_Rock

   The Indian Head Rock is an eight-ton sandstone boulder, which had rested at the bottom of the Ohio River, [1] until September 2007 when it was retrieved by a group of local divers, led by amateur historian Steve Shaffer [2] of Ironton, Ohio. The recovery of the perennially submerged rock, which was the subject of local lore since the 1800s, was ...