Keywords: NHL Marl pit.JPG en Hadrosaurus Foulkii Leidy Site a National Historic Landmark since October 12 1994 At the east end of Maple Ave near Cooper River in Haddonfield New Jersey Near this site I guess right here at the bottom of the pit the first fairly complete dinosaur skeleton was discovered in 1858 It was also the first mounted dinosaur skeleton NHL plaque is just above this about 10 yards north and says that the site is adjacent own Smallbones 2010-05-11 39 54 34 N 75 1 40 W Hadrosaurus Foulkii Leidy Site Marl |