Sepulvede Pueblo is located in coastal Orange County, California, near San Diego Creek at the head of Newport Bay. Construction of the structure is thought to have begun in the early historic period. The two types of samples (Adobe and Tar) provide a useful comparison for estimating the age of construction of "Room 1" of the Sepulvede Pueblo. Modern pollen accumulated after the tar was applied to the roof, so its pollen indicates post-construction vegetation. However, pollen in the adobe was incorporated at the time of adobe manufacture - just prior to construction.
The pollen and spore percentages in the tar samples are comparable to those of pre-urban samples from nearby San Joaquin Marsh. Cruciferae (mustard) ranges from 5 - 12 %, storksbill from 4 - 7%, and Thecaphora (Fig. 2) from 1 - 2% (Table 1,2). Other Composite is less than 50%, eucalyptus and storksbill are present. However, in the adobe samples, Thecaphora and storksbill are absent, the Other Compositae percentages are high, and Quercus (Fig. 2) percentages are low (Fig. 1). These values are similar to those from San Joaquin Marsh dating to the earliest historic period. In other words, the pollen and spore frequencies date the adobe to the earliest historic period; whereas the tar dates to the later, pre-urban age.
The season of manufacture for the foundation brick can be inferred from its high (66%) Typha-Sparganium (cattail) pollen percentages. Presumably, water from San Diego Creek was used in the construction of this adobe. Typha blooms in June, but Sparganium species bloom from April to August. Thus the adobe was made in summer or late spring. No riparian taxa were found in the other adobe samples, so they were manufactured at other times or with other (well?) water.BACK