 The Hartz Mountains were named after the Harz mountain range in Germany.Most of the park is over 600 metres above sea level, with altitudes ranging from 160 m at the Picton River to 1,255 m at Hartz Peak.The backbone of rock in the park is dolerite, while the southern areas at lower altitudes are constituted from sedimentary rocks formed from sediments deposited by marine, glacial and freshwater sources between 355 and 180 million years ago.