<P> The plateau has been transformed by erosion and by quarrying, which took place not only in the Neolithic, but also in classical times . There are four 10 - metre - long (33 ft) and 20 - centimetre - wide (7.9 in) channels on the southern part of the plateau, interpreted as the remains of an ancient quarry from which rectangular blocks were taken . These are possibly related to a square building in the neighbourhood, of which only the foundation is preserved . Presumably, this is the remains of a Roman watchtower which belonged to the Limes Arabicus . However, this is not known with certainty . </P> <P> Most structures on the plateau seem to be the result of Neolithic quarrying, with the quarries being used as sources for the huge, monolithic architectural elements . Their profiles were pecked into the rock, with the detached blocks then levered out of the rock bank . Several quarries where round workpieces had been produced were identified . Their status as quarries was confirmed by the find of a 3 - by - 3 - metre piece at the southeastern slope of the plateau . Unequivocally Neolithic are three T - shaped pillars that have not been levered out of the bedrock . The biggest of them lies on the northern plateau . It has a length of 7 m (23 ft) and its head has a width of 3 m (10 ft). Its weight may be around 50 tons . The two other unfinished pillars lie on the southern Plateau . </P> <P> At the western edge of the hill, a lion - like figure was found . In this area, flint and limestone fragments occur more frequently . It was therefore suggested that this could have been some kind of sculpture workshop . It is unclear, on the other hand, how to classify three phallic depictions from the surface of the southern plateau . They are near the quarries from classical times, making their dating difficult . </P> <P> Apart from the tell, there is an incised platform with two sockets that could have held pillars, and a surrounding flat bench . This platform corresponds to the complexes from Layer III at the actual tell . Continuing the naming pattern, it is called "complex E ." Owing to its similarity to the cult - buildings at Nevalı Çori it has also been called "Temple of the Rock ." Its floor has been carefully hewn out of the bedrock and smoothed, reminiscent of the terrazzo floors of the younger complexes at Göbekli Tepe . Immediately northwest of this area are two cistern - like pits, believed to be part of complex E. One of these pits has a table - high pin as well as a staircase with five steps . </P>

Where was the oldest well-preserved neolithic city found