Although at least 20 types of rocks have been identified at the site, Stonehenge is made from two primary types of stone: sarsen sandstone and bluestone, with the stones forming the external wall of the circle in Stonehenge being made from the former. Sarsen sandstone is around 60 million years old and is essentially silicified sandstone that is much like the sandstone that is found about 19 miles to the north of the world-famous monument.Know More
The pie-shaped structures for which Stonehenge is so readily known for are made from sarsen sandstone. The largest of these weighs an estimated 40 tons, which is the weight of a cement truck that's fully loaded. The size of this stone and others has led to many theories about how the stones arrived at the location in the first place.
The smaller of the stones at Stonehenge are bluestones, and although they are smaller than the sarsens, some are still massive, weighing up to an estimated 4 tons. They are foreign to the area, leading to even more speculation as to how they arrived there.
There are other types of rock at the location, including gneiss, schist, limestone and greenstone, along with some unidentified sandstones. The "Altar" at Stonehenge is from a foreign sandstone of unknown origin.Learn more about Prehistory
To build a rock wall, add layers of landscape fabric and landscape stones in a trench, and build the wall on top of the base using rocks and mortar. Use masonry string line tied between two stakes to ensure each layer is level.Full Answer >
Some interesting facts about sandstone are that it is composed of cemented sand and therefore is a type of sedimentary rock; it has one of the larger particles of all the rock types; and it is used for building, paving, construction and glass making. Sandstone forms where sand is laid down and buried. One famous example of this is the red rock formations of the Grand Canyon in Arizona.Full Answer >
The earliest tools of cavemen, dating back millions of years, were made of bone, stone and wood. The handaxe was the first major tool developed by early humans, consisting simply of a sharpened stone held in the hand and used to chop and pierce.Full Answer >
Cavemen used a variety of stone and wood weapons including clubs, the atlatl, spears, slings, arrows and knives. Other common tools, such as stone hand axes or even heavy grinding stones, could also be used as weapons if necessary.Full Answer >