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Claystone – Clastic sedimentary rock composed primarily of clay-sized particles. Coal – Combustible sedimentary rock composed primarily of carbon. Conglomerate – Sedimentary rock composed of smaller rock fragments. Coquina – Sedimentary rock that is composed mostly of fragments of shells.
The rock comprising the bulk of a boulder is riddled with large cracks called septaria that radiate outward from a hollow core lined with scalenohedral calcite crystals. The process or processes that created septaria within Moeraki Boulders, and in other septarian concretions, remain an unresolved matter for which a number of possible ...
Boulder in British Columbia, Canada. Kämmenkivi stone on the Pisa hill in Kuopio, Finland. In geology, a boulder (or rarely bowlder) [1] is a rock fragment with size greater than 25.6 cm (10.1 in) in diameter. [2] Smaller pieces are called cobbles and pebbles. While a boulder may be small enough to move or roll manually, others are extremely ...
The Flatirons are rock formations in the western United States, near Boulder, Colorado, consisting of flatirons.There are five large, numbered Flatirons ranging from north to south (First through Fifth, respectively) along the east slope of Green Mountain (elev. 8,148 ft or 2,484 m), and the term "The Flatirons" sometimes refers to these five alone.
Rijksmuseum Amsterdam. A blockfield[1] (also spelt block field[2]), felsenmeer, [1] boulder field[1][2] or stone field[2] is a surface covered by boulder- or block-sized rocks usually associated with a history of volcanic activity, alpine and subpolar climates and periglaciation. Blockfields differ from screes and talus slope in that ...
A glacial erratic is a glacially deposited rock differing from the type of rock native to the area in which it rests. Erratics, which take their name from the Latin word errare ("to wander"), are carried by glacial ice, often over distances of hundreds of kilometres. Erratics can range in size from pebbles to large boulders such as Big Rock ...
The top of the boulder layer is virtually level with the approaching path. [4] This boulder field, known as the Hickory Run boulder field, is the largest of its kind in the Appalachian region. It consists of a very gently sloping expanse of boulders that occupies the axis of a small valley with approximately 100-foot (30 m) of relief. [6]
Cobble (geology) A cobble (sometimes a cobblestone) is a clast of rock defined on the Udden–Wentworth scale as having a particle size of 64–256 millimeters (2.5–10.1 in), larger than a pebble and smaller than a boulder. Other scales define a cobble's size differently. A rock made predominantly of cobbles is termed a conglomerate.