A family of native North American languages spoken in the upper Missouri Valley in North Dakota, in the Platto Valley in Nebraska, in southwestern Arkansas, and in neighboring parts of Oklahoma, Texas and Louisiana. The geographical region that encompasses eastern Oklahoma, southwestern Arkansas, western Louisiana, and eastern Texas which was the homeland of the Native American Caddo people. Wormlike, almost blind, tropical amphibians of the order Apoda. Fossil remains of calcareous nannoplankton. Protists that normally produce coccoliths during some phase in their life cycle.
Calcite can be white, colorless, or pale shades of gray, yellow, and blue.
Time is determined by the number of such units that have preceded or elapsed with reference to a specific point in time. It is named after Cambria, the Roman name for Wales, where rocks of this age were first studied. A period of time in the Paleozoic era that includes the Pennsylvanian and Mississippian periods and extended from 360 to 286 million years ago. Fish having a skeleton composed mostly of cartilage, as sharks and rays. Cartilage is gristle or a firm, elastic, flexible type of connective tissue.