The Świętokrzyskie Mountains (, ), often anglicized to Holy Cross Mountains, are a mountain range in central Poland, near the city of Kielce. The Świętokrzyskie Mountains are some of the oldest mountains in Europe, and the highest between the Sudetes and the Ural Mountains. The mountain range comprises several lesser ranges, the highest of which is Łysogóry (literally "Bald Mountains"). The two highest peaks are Łysica, 614 m (2014.44 ft), and Łysa Góra, 594 m (1948.81 ft). Together with the Jura Krakowsko-Częstochowska, the mountains form a region called the Lesser-Poland Upland (Wyżyna Małopolska). They cover an area of 1684 km² (650 mi²). The approximate location is . Prehistory The Świętokrzyskie Mountains are one of the oldest mountain ranges in Europe. They were formed during the Caledonian orogeny of the Silurian period and then rejuvenated in the Hercynian orogeny of the Late Carboniferous period. The region was once on the southern coast of the ancient supercontinent of Laurasia. The oldest known evidence of tetrapods comes from 395-million-year old fossil footprints found in Zachełmie. The rocks were formed from a marine tidal flat or lagoon. The mountains have also yielded the oldest evidence of Dinosauromorpha, pushing back the evolution of dinosaurs to small, four-legged animals living during the Early Triassic period. The fossil footprints date to some 250 million years ago, only a couple of million years after the Permian–Triassic extinction event, during a time when the environment was still destabilized. Footprints of early bipedal dinosaurs known as Sphingopus, from 246 million years ago, have also been found. History From the early Middle Ages the mountains were a place of extensive copper and iron mining. Later they were also a significant site of limestone and red sandstone extraction. The central part of the mountains now contains the Świętokrzyski National Park. The name "Holy Cross Mountains" refers to a Christian relic from a nearby Benedictine monastery on Łysa Góra, said to be a small piece of wood from the Cross on which Jesus Christ was crucified. The region saw some significant partisan activity during World War II (see Detached Unit of the Polish Army, Holy Cross Mountains Brigade). Climate The climate of the Świętokrzyskie Mountains differs from the surrounding regions. The average annual temperature is 6–7 ° C. The yearly rainfall ranges from 650 to 900mm. The highest peaks are covered in snow from November to April. The ice sheet persist on average