Alamo Archaeology Church Preservation - July 18

July 18, 2025

Archaeological investigations continued at the Alamo Church last week. Excavations for EU-14 were completed, while excavations for EUs 31 and 34 continued through the week.

Excavations at EU-14 continued to reveal several unanticipated disturbances, including an abandoned clay pipe. Archaeologists completed EU-14 with a terminating depth of 180 cm below surface. No intact archaeological deposits were encountered. Final unit documentation will occur this week, with a plan map, soil profile maps, and final unit scan.

Clay pipe inside an excavation unit
EU-14 at approximately 180 cm below surface, photo facing west.
Inside of a rocky excavation unit with a dark clay area at the bottom
EU-31 at approximately 120 cm below surface, photo facing south.

Archaeologists continued to excavate in EU-31. In the south-central section of the unit, archaeologists exposed a deposit consistent with by previous construction, likely from the commercial period at the site. The presence of mortar and plaster, mule shoes, nails/hardware, brick, and European earthenware ceramic indicate the deposit post-date the mission period. The dark clay loam on the far eastern section of the unit is a natural, intact soil that directly precedes the culturally sterile R horizon, or caliche hardpan.

Mortar and plaster recovered from an excavation unit next to a ruler for size
Mortar and plaster from EU-31.
Mule shoe and hardware on a wire background next to a ruler for size
Mule shoe and hardware from EU-31.

Excavations at EU-34 also continued. Archaeologists continued to reveal soil deposits likely associated with the construction of the garden walls, as well as the intact clay loam deposits before encountering the R Horizon. At approximately 120 cm below surface, archaeologists came across an exciting find - several Valero Red Painted sherds in situ. Upon closer examination, archaeologists were able to identify red painted designs, as well as distinct wheel striations on the interior and exterior surfaces of the sherds. Valero ware is a Spanish Colonial ceramic that dates to 1700 to 1825. These are commonly encountered during archaeological investigations at the Alamo and other mission era sites across San Antonio.

Inside of a rocky excavation unit with a path to a deeper opening
EU-34 at approximately 130 cm below surface, photo facing south.
Red clay deposits at bottom of excavation unit next to a shovel
Valero sherds in situ from EU-34.