Later, while the technique remains unaltered, a difference is seen in the forms, which become lighter, more varied, and more symmetrical. Such shapes as the stamnos, kantharos, and trefoil-mouthed oinochoë now for the first time appear. The methods of ornamentation are also modified; new varieties of incised patterns are seen, and the bodies of the vases are sometimes fluted or ribbed; while such motives as friezes of ducks, which are also found on the contemporary bronzes,[2268] now first find a place. M. Gsell, describing in detail the various fabrics found in the Vulci tombs of this period,[2269] speaks of pottery of a grey clay baked to red, perhaps in a furnace, forming urns and jars of a considerable size. He thinks that some primitive kind of wheel (see above) must have been used to produce these. In some of the _impasto_ wares there is a decided advance in technique, the clay being better levigated and the walls of the vases thinner. Some black wares seem to have been _fumigated_ like the later _bucchero_. Generally speaking, both incineration and inhumation are still practised. The ornaments are incised, stamped, or painted, and the decoration almost exclusively linear, the stamped patterns being usually in the form of stars. This pottery is, in fact, merely a continuation of that of the pit-tombs, except that the imitation of metal-work is much more strongly in evidence. Yet another variety preserves the methods and forms of the Villanuova class, but introduces a new kind of clay, altogether black, as distinguished from the earlier reds and browns. A remarkable specimen of this early black ware found at Orvieto has incised upon it the subject of Bellerophon and the Chimaera, the style being, as we should expect, childish to the verge of the ludicrous.[2270] Later, the black wares acquire a very fair glazed surface, and are ornamented with incised linear patterns of zigzags, chevrons, etc.; these are mostly small vases. It is in these two particularly that we see the forerunners of the highly developed _bucchero_ ware. Besides these local fabrics, there are found Greek imported wares with Geometrical decoration of pale yellow clay, with ornaments in brown turning to red; the commonest form is the oinochoë, and the patterns include circles, zigzags, wavy lines, embattled patterns, etc. These are all wheel-made, and are, in fact, the same types as are found in the Dipylon cemetery at Athens and in Boeotia (Chapter VII.); the earliest instances belong to the end of the eighth century, in some late pit-tombs at Caere, in which also “Proto-Corinthian” pottery was found. They coincide with the great impetus given to Greek colonisation in Sicily and Southern Italy, and probably came by that way into Etruria. It should be borne in mind that these vases were imported not for their own merit, but for the value of their contents. It has already been mentioned that local imitations of them are found in the trench-tombs.