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Description
This dissertation creates models of past potential vegetation in the Southern Levant during most of the Holocene, from the beginnings of farming through the rise of urbanized civilization (12 to 2.5 ka BP). The time scale encompasses the rise and collapse of the earliest agrarian civilizations in this region. The archaeological record suggests that increases in social complexity were linked to climatic episodes (e.g., favorable climatic conditions coincide with intervals of prosperity or marked social development such as the Neolithic Revolution ca. 11.5 ka BP, the Secondary Products Revolution ca. 6 ka BP, and the Middle Bronze Age ca. 4 ka BP). The opposite can be said about periods of climatic deterioration, when settled villages were abandoned as the inhabitants returned to nomadic or semi nomadic lifestyles (e.g., abandonment of the largest Neolithic farming towns after 8 ka BP and collapse of Bronze Age towns and cities after 3.5 ka BP during the Late Bronze Age). This study develops chronologically refined models of past vegetation from 12 to 2.5 ka BP, at 500 year intervals, using GIS, remote sensing and statistical modeling tools (MAXENT) that derive from species distribution modeling. Plants are sensitive to alterations in their environment and respond accordingly. Because of this, they are valuable indicators of landscape change. An extensive database of historical and field gathered observations was created. Using this database as well as environmental variables that include temperature and precipitation surfaces for the whole study period (also at 500 year intervals), the potential vegetation of the region was modeled. Through this means, a continuous chronology of potential vegetation of the Southern Levantwas built. The produced paleo-vegetation models generally agree with the proxy records. They indicate a gradual decline of forests and expansion of steppe and desert throughout the Holocene, interrupted briefly during the Mid Holocene (ca. 4 ka BP, Middle Bronze Age). They also suggest that during the Early Holocene, forest areas were extensive, spreading into the Northern Negev. The two remaining forested areas in the Northern and Southern Plateau Region in Jordan were also connected during this time. The models also show general agreement with the major cultural developments, with forested areas either expanding or remaining stable during prosperous periods (e.g., Pre Pottery Neolithic and Middle Bronze Age), and significantly contracting during moments of instability (e.g., Late Bronze Age).
ContributorsSoto-Berelov, Mariela (Author) / Fall, Patricia L. (Thesis advisor) / Myint, Soe (Committee member) / Turner, Billie L (Committee member) / Falconer, Steven (Committee member) / Arizona State University (Publisher)
Created2011
Description
This study examines almost 5000 lithic artifacts from three rockshelters in the Belize, part of the Maya Lowlands. These sites bear evidence of human occupation throughout the last 14,000 years, a period over which I assess change in four lithic traits: 1) cortex, or the weathered outer surface of a toolstone cobble; 2) platform type, or the degree of preparation of striking platforms; 3) bifaciality, or whether tools were flaked on one or both faces; and 4) retouch, or the removal of small flakes from tool edges. These traits are differentially associated with two modes of technological organization: curation and expedience. Curation involves greater effort spent creating tools with longer use-lives and is associated with low levels of cortex, more complex platforms, more bifacial flaking, and higher amounts of retouch. It is also more typical of highly mobile hunter-gatherers who move their residential base often. Expedience, which entails less effort creating lithics with shorter use-lives, is associated with higher amounts of cortex, simpler platforms, less bifacial flaking, and lower levels of retouch; it is also associated with more sedentary hunter-gatherers. My results indicate that, during the Late Pleistocene in Belize, groups favored curation and were likely highly mobile foragers inhabiting an open grassland landscape. However, not long after the Pleistocene-ending Younger Dryas climatic event (~12,600 to 11,700 cal BP), these groups began to favor expedience, indicating they’d begun to adopt a more sedentary lifestyle. This shift towards expedience and sedentism continued throughout the Early and Middle Holocene, when closed-canopy tropical forests came to dominate the landscape. I conclude that these foragers began to adopt lower levels of residential mobility much earlier than generally thought. Because the sparse, unpredictable nature of wild tropical forest flora and fauna favors high residential mobility, this means they were likely manipulating their landscapes and experimenting with cultivars several millennia before the first appearance of sedentary farming villages. This further implies that the origins of sedentism and agriculture in tropical forests must be sought in the changing lifeways of pre-agricultural, semi-sedentary forager-horticulturalists of the deep past.
ContributorsDennehy, Timothy J. (Author) / Smith, Michael E. (Thesis advisor) / Barton, C. M. (Committee member) / Marean, Curtis W. (Committee member) / Prufer, Keith M. (Committee member) / Arizona State University (Publisher)
Created2021