Keywords: SourlandTraprock.jpg argillite and argillite derived hornfels emerges along the 380ft 115m contour of ” located near Hillsborough Township New Jersey Typical argillite in this region is a grayish color while hornfels appears blackish and more fine grained due to the effects of contact metamorphism self-photographed original text Photo taken by me 1 <br/> 2009-04-26 Lithium6ion wikipedia en Lithium6ion Original upload log en wikipedia Liftarn CommonsHelper page en wikipedia SourlandTraprock jpg 2009-04-26 23 38 Lithium6ion 2592×1944× 1924041 bytes <nowiki>A ledge of volcanic trap rock emerges along the 380ft 115m contour of Sourland Mountain near Hillsborough Township New Jersey Photo taken by me </nowiki> Sourland Mountain Sourland Mountain Rock formations in New Jersey Hornfels Mesozoic volcanism Nature of the Appalachian Mountains Volcanism of New Jersey Rocks in New Jersey |