Geologists believe that petroleum forms from the organic material in deeply buried and heated ocean ooze.

Extremely common in the Earth's crust, igneous rocks are volcanic and form from molten material. To these beach stone types belong pebbles like: quarzite, granite, slate, pumice, marble etc. Given enough time and depth of burial, these sediments lithify (turn to stone) and give rise to the sedimentary rock types: black shale, siltstone, and micritic (muddy) limestone.

The most common color of jasper that I’ve experienced are yellow and tan.

There are three basic types of rock: igneous, sedimentary, and metamorphic. The first two types of rocks, Igneous and Metamorphic, are formed after molten rock from magma and lava eventually cools down and finally hardens into rock again. There are over 700 hundred types of igneous rocks, and they are generally the hardest and heavies t o f all rocks. Red jasper can also be common on some beaches. When rockhounding this type of beach stone, look for surfaces on the stone that are shiny when wet, but dull and porous when dry. Green jasper is probably the rarest color to find.