Edward Drinker Cope
In Haddonfield, New Jersey were marlpits, where a dinosaur skeleton was discovered in 1858 by William Foulke and named Hadrosaurus foulkii by Dr. Leidy of Philadelphia's Academy of Natural Sciences.p151/8 Cope found more fossils in the marlpits there. For example, he described Elasmosaurus platyurus and Laelaps in 1868. Edward Cope also went on expeditions to caves; the last cave he visited was the Wyandotte Caves in Indiana in 1871.p151/5