<P> Jug Rock is a natural geological formation located outside of Shoals, Indiana, in the valley of the East Fork of the White River . It is composed of sandstone, and is the largest free - standing table rock formation (also called a "tea table") in the United States east of the Mississippi River . It is part of the Mansfield formation, laid down in the Pennsylvanian geological epoch, roughly 325 to 286 million years ago . Erosion along fracture lines separated it from a nearby cliff . A companion feature, House Rock, stands opposite Jug Rock . </P> <P> In the Second Report of the Geological Survey of Indiana, published in 1871, State Geologist E.T. Cox wrote: One of the most interesting spots to visit, for obtaining a view of this character of scenery, is near the town of Shoals, on the road to the Indian Sulphur Springs . A high ridge of millstone grit, here, terminates within a few yards of the East Fork of White river, from the top of which, there is a projecting mass of conglomerate sandstone, called the "Pinnacle," which stands one hundred and seventy feet above the level of the stream . Cyclopean blocks, that have broken off, lie around the foot of the ridge, in every conceivable position . On the north side of this ridge, the conglomerate has been cut through by disintegrating forces, which left, at some distance from the main ledge, a tall mass of rock, which has received the name of "Jug Rock," from the fancied resemblance which it bears to a jug . It is forty - two feet high and supports, on its top, a flat projecting layer, which is called the "stopper ." Just above the bulge of the jug are irregular lines of stratification, known as false bedding . The lower part is thickly set with quartz pebbles . The frontispiece to this volume presents a view of the "Jug Rock" which was copied from a photograph taken by D. Allbright . For this faithful representative of a highly interesting geological scene, I am indebted to B.F. Devol, and D. Allbright, of Shoals . </P>

What is another name for a table rock formation like jug rock