The period of the fine thin pottery in Elam comes suddenly to an end, and the people of the second prehistoric period seem to have been intruders who were less civilized than their predecessors and unacquainted with the art of making the older ware. Their pottery is coarse and porous, and the geometric designs upon it are traced with the pen, not freely painted as in the case of the earlier ceramic. The animal and vegetable designs of the older ware have disappeared, and the zones, triangles and other geometric figures which take their place are traced in black or maroon-red upon a yellow clay. The resemblance between this pottery and that of Kara Eyuk is even greater than in the case of the pottery of the first period. Thick cylindrical vases are common, as well as bowls with a flat bottom and broad sides. Some of the vases resemble the bulbous vases of the Egyptian Twelfth dynasty; there are others with flat bottoms and angular sides which are also like Egyptian water-jars of the same Twelfth-dynasty period. Along with these more characteristic forms of pottery many small, unpainted cups have been found, as well as a few finer wheel-made vases of ovoid shape and yellow or reddish colour. It should be added that coarse, red, hand-made pottery abounds in both the prehistoric periods, as indeed it does also in the later historic epoch. As the second prehistoric epoch drew to a close at Susa, many indications of an advance in culture began to show themselves. Vases and flat-bottomed cups of soft stone were introduced, among them being a few of alabaster; the bricks began to be burnt in a kiln, and even seals with a species of writing upon them made their appearance. Nevertheless, the neolithic age does not pass into the age of metal through any transitional stages. The earliest stratum which marks the historic age yields for the first time clay tablets with inscriptions, the characters of which are already developing out of pictures into the cursive cuneiform. The inscribed cylinder-seals of Babylonia naturally appear along with them; alabaster vases, cups and bowls become common, and some of them are cut into the forms of animals. Comparatively little pottery has been found in this stratum; but this is probably an accident.