Almost no exclusively 17th century artifacts were found at Marlborough; at least, there were very few sherds or objects that could not have originated equally well in the 18th century. The exceptions are the following: Westerwald blue-and-white stoneware with gray-buff paste; several sherds of delft and other tin-enameled ware, late 17th century in type, and an early 17th-century terra cotta pipestem. Otherwise, we find a scattering of things belonging to types that occurred in both centuries: North Devon gravel-tempered ware, which was imported both in the late 17th and early 18th centuries; yellow-and-brown "combed" ware, which elsewhere occurs most commonly in 18th century contexts; pewter trifid-handle spoons, the form of which dates from about 1690 but which may have been cast at a later date in an old mold (a wavy-end spoon in the style of 1710 may also have been cast later). Fragments of an onion-shaped wine bottle may date from the first decade of the 18th century, but the presence of such bottles in the Rosewell trash pit shows that bottles, being too precious to throw away, were kept around until they were broken--in the case of Rosewell for 60 or 70 years. Thus the Marlborough sherds cannot be excluded from the Mercer period. The same may be said of a late 17th-century type of fork. Thus, there is virtually no evidence of the Port Town occupation, especially as the few 17th-century artifacts that were found may well have belonged to the Mercers rather than to Marlborough's previous occupants.
The ceramics and glass are the most readily datable artifacts, and these coincide almost altogether with the period of John Mercer's lifetime. Common earthenwares are predominantly Tidewater and Buckley types, with a scattering of others, most of which are recurrent among other Virginia and Maryland historic-site artifacts. No distinct type emerges to suggest that there may have been a local Stafford potter. Common stonewares occur in such a variety of types that no source or date can be attributed, although there is some evidence of the work of William Rogers' shop in Yorktown. Westerwald stonewares are predominantly of the blue-and-gray varieties commonest in the second quarter of the 18th century.