But the necropolis has been to a great extent protected by the accumulations of blown sand.
From the very beginning there had been an intensity, a seriousness to the falling flakes that spoke of accumulations far in excess of anything the Deans had seen to date.
Such roofs are not suitable for cold climates, for accumulations of snow might overburden the structure and would also cause the wet to penetrate through any small crevices and under flashings.
The exact form of these three interior valleys, which had an important influence on the construction and history of the city, is still imperfectly known, as they are to a great extent obliterated by vast accumulations of rubbish, which has filled them up in some places to a depth of more than 100 ft.
The only known spring existing at present within the limits of the city is the "fountain of the Virgin," on the western side of the Kidron valley, but there may have been others which are now concealed by the accumulations of rubbish.