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2. River gravel - Wikipedia

   en.wikipedia.org/wiki/River_gravel

   Migratory Canada geese cross the river gravel and concrete aggregate mix surface of the Colonial Parkway in eastern Virginia.. 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]

3. Gravel - Wikipedia

   en.wikipedia.org/wiki/Gravel

   Gravel (largest fragment in this photo is about 40 mm (1.6 in)) Gravel (/ ˈ ɡ r æ v əl /) is a loose aggregation of rock fragments.Gravel occurs naturally on Earth as a result of sedimentary and erosive geological processes; it is also produced in large quantities commercially as crushed stone.

4. Petoskey stone - Wikipedia

   en.wikipedia.org/wiki/Petoskey_stone

   A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized rugose coral, Hexagonaria percarinata. [1] Such stones were formed as a result of glaciation, in which sheets of ice plucked stones from the bedrock, grinding off their rough edges and depositing them in the northwestern (and some in the northeastern) portion of Michigan's lower peninsula.

5. Pebble - Wikipedia

   en.wikipedia.org/wiki/Pebble

   A pebble is a clast of rock with a particle size of 4–64 mm (0.16–2.52 in) based on the Udden-Wentworth scale of sedimentology. Pebbles are generally considered larger than granules (2–4 mm (0.079–0.157 in) in diameter) and smaller than cobbles (64–256 mm (2.5–10.1 in) in diameter).

6. Rock garden - Wikipedia

   en.wikipedia.org/wiki/Rock_garden

   The Japanese rock garden, or dry garden, often referred to as a "Zen garden", is a special kind of rock garden with a few large rocks, and gravel over most of the surface, often raked in patterns, and no or very few plants. Other Chinese and Japanese gardens use rocks, singly or in groups, with more plants, and often set in grass, or next to ...

7. Puddingstone (rock) - Wikipedia

   en.wikipedia.org/wiki/Puddingstone_(rock)

   This conglomerate consists of pebbles and cobbles of white vein quartz, red and green quartzite, sandstone, red and gray chert, and red shale. The grayish-purple to grayish-red conglomerate and sandstone is cemented largely by hematite and microcrystalline quartz. The cobbles that it contains range in size from 2.5 in (6.4 cm) to 6.5 in (17 cm).