A cluster of fossils ~ as an oil lamp! Five hundred million years ago, all of the state of Arkansas was beneath an ocean and it was south of the equator. About 250 to 300 million years ago, part of our continent converged and uplifted the portions now called the Ozark Mountains. Thus, pushing sea level to mountain heights! In fact, much of the river bluffs along northern Arkansas waterways are made up of crinoids cemented together. The most common fossil found in the state of Arkansas is the crinoid, an animal related to starfish and sea urchins. The crinoid is sometimes called a sea lily because of its plant-like appearance. This piece, found in northern Arkansas is made of a multitude of crinoids held together by nature's cement!