| A roadcut exposure (at right) of the upper Ordovician to lower Silurian Hanson Creek Formation in Eureka County, Nevada, a number of miles west of the western border of White Pine County, Nevada. Produces locally common brachiopods, crinoid columnals, graptolites, and corals, in addition to important suites of latest Ordovician conodonts (minute tooth and jaw-like structures, unrelated to modern jaws, that served as a unique food-gathering apparatus in an extinct lamprey eel-like animal), just prior to the great extinction event at the conclusion of the Ordovician Period. A Google Maps street car perspective that I edited and processed through photoshop. |