Large English Flint Limestone-Chalk Natural Nodule.

This classic English Flint Nodule is covered in limestone Chalk and occurred naturally. This example has one end broken off revealing the flint core stone. This nodule was found on the Salisbury plains near Stonehenge.

This blob like shape's maximum dimensions are: 4.75" long by 1.75 at its widest point and about 1.5" thick. This piece weighs in at ~10 ounces and can be used for lapidary or knapping.

Flint is the result of ancient sea sponges being caught in the fossil bearing sea floor. Flint's high silicon content is due to the silicon content of the sea sponge that it formed from.

Chalk, a soft porous white limestone, deposited in a marine environment during the Upper Cretaceous period when Southern England was under water.
Chalk is a soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite. It forms under relatively deep marine conditions from the gradual accumulation of minute calcite plates shed from micro-organisms called coccolithophores.
The Southern England Chalk Formation largely lies within the county of Wiltshire, the location of Stonehenge.

This bright white Chalk becomes most apparent in aerial photos following Archaeological Digs and was used to mark the Aubrey holes at Stonehenge.

Some feel that the unusually high density of population arounf Stonehenge area was due to the ready availability of Flint used to gain mastery of fire. So while this is not strictly a Stonehenge Collectable, it is a fine example of what just may have been a reason behind why Stonehenge was built at that location.

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