Archaeological excavations at Unguja Ukuu recovered a rock crystal cabochon seal with the word lillāh (“for God”) inscribed in the Kufic script on its domed surface. The artifact is an intaglio amulet seal engraved in the negative. Microscopic examination of the seal surfaces reveals that a rotary tool was used to make the initial inscription. At some later point, a diagonal spall was removed across part of the inscription. The diagonal spall appears to be along a natural crystal plane. It is impossible to determine if this was the result of intentional defacement or an accidental process that might have resulted in the eventual deposition of the seal. Strata dated by radiometric and relative methods coupled with the style of the Kufic script date the seal to the late-8th to 9th centuries CE. This artifact is the earliest known example of an Islamic amulet seal and of writing in the Zanzibar Archipelago.
The intertidal zone, covering the nearshore fringe of coasts and islands and extending from the high-water mark to areas that remain fully submerged, encompasses a range of habitats containing resources that are as important to modern populations as they were to humans in prehistory. Effectively bridging land and sea, intertidal environments are extremely dynamic, requiring complexity and variability in how people engaged with them in the past, much as they do in the present. Here we review and reconsider environmental, archaeological, and modern socio-ecological evidence from the Zanzibar Archipelago on eastern Africa’s Swahili coast, focusing on marine molluscs to gain insight into the trajectories of human engagement with nearshore habitats and resources. We highlight the potential drivers of change and/or stability in human-intertidal interactions through time and space, set against a backdrop of the significant socio-economic and socio-ecological changes apparent in the archipelago, and along the Swahili coast, during the late Holocene.
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