Early human occupation of Australia's eastern seaboard.

Secure archaeological evidence for human occupation on the eastern seaboard of Australia before ~ 25,000 years ago has proven elusive. This has prompted some researchers to argue that the coastal margins remained uninhabited prior to 25 ka. Here we show evidence for human occupation beginning between 30 ± 6 and 49 ± 8 ka at Wallen Wallen Creek (WWC), and at Middle Canalpin Creek (MCA20) between 38 ± 8 and 41 ± 8 ka. Both sites are located on the western side of Minjerribah (North Stradbroke Island), the second largest sand island in the world, isolated by rising sea levels in the early Holocene. The earliest occupation phase at both sites consists of charcoal and heavily retouched stone artefacts made from exotic raw materials. Heat-treatment of imported silcrete artefacts first appeared in sediment dated to ~ 30,000 years ago, making these amongst Australia's oldest dated heat-treated artefacts. An early human presence on Minjerribah is further suggested by palaeoenvironmental records of anthropogenic burning beginning by 45,000 years ago. These new chronologies from sites on a remnant portion of the continental margin confirm early human occupation along Sahul's now-drowned eastern continental shelf.

7,200 years old constructions and mudbrick technology: The evidence from Tel Tsaf, Jordan Valley, Israel.

The history of mudbrick production and construction in the southern Levant may be dated as far back to the Pre-Pottery Neolithic A. However, at many of the sites where mudbrick remains were noted, their preservation was poor, so investigation of their production and the related construction techniques in antiquity was precluded. The 7,200 year old (cal BP) site of Tel Tsaf, located in the Jordan Valley, is distinguished by outstanding preservation of mudbrick architecture, which enables us to delve into various issues related to mudbrick technology, construction and preservation. The present paper discusses some of the mudbrick features at Tel Tsaf and their characteristics and offers a comprehensive analytical study of the mudbricks from multiple contexts and phases. These demonstrate consistency in three of the four measured variables: magnetic susceptibility, organic content and calcium carbonate equivalent. The results of our study suggest that while we can identify morphometric variability between bricks and walls, by and large, a uniform composition characterized the tested assemblages without any temporal or spatial variability. This indicates that a single locally-sourced raw material was used and that recycling of old decayed mudbricks was likely practiced. The consistency of mudbrick-production during all phases of the occupation at Tel Tsaf and the absence of multiple recipes implies that a shared production and technological know-how was maintained for at least 500 years at the site.