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Culture and Ecology of Chaco Canyon and the San Juan Basin

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-------48 <strong>Chaco</strong> Project Syn<strong>the</strong>sisYIIS a.1! EOUAH EOLIAII.1,000STRATIGRAPliY PROCESSES0- locol _EOU .. II UillT l~#poIIII,..'"'"../I- $OilI-I11"./0",..'"2- iI"bl/l~,,/I"nUI'Pf:~ PALEOSOLAI.l.UVIALSTRATIGRAPHY!'OST-IOilITOClt"COfl.UVIALPROC£SSESollU'IIilllfl 01hmw"I",' .;g;"C/l41111~ trmcllillgARCHAEOLOGYICAVA.IO""lILO I. II, litIASKETWAKEIICLIMATEZIltaCCNTURYOilY Wt;T..~.:VEGETATION~ OCUIIT-Ia-z3-.. - UNIT(Ol.l""25-1- I7-dflne*POlili."dUll'ULLO..".,--------le.I'flJlw;vm <strong>of</strong>loctll OIlgl.til/wi"'" 01It"dWt:ll.,., ~ig;nci.n..",ARCHAIC.. -3;! ..~ :}: ..-4:::: 11SHRUI..~~Ii ..;;:l: -$.:: oS- - -6-7a-.,oili/lztllIOllGIIASSLIoIiD-8soU,- .. ... d .... I_,... ,, '"«:,OWER PALEOSOL10- 1'10" fQoioeatOOn do InAa.;, , , ... ...F!,~"OA PAL(OSOLcS4ild",./opmH'oPALEO-INOIAHEFG-910Figure 2.6.Environmental changes in <strong>Chaco</strong> <strong>Canyon</strong>: A) stratigraphy <strong>of</strong> dunes <strong>and</strong> soils <strong>of</strong> <strong>Chaco</strong>Dune field; B) processes affecting dune field; C) stratigraphy <strong>of</strong> alluvium at <strong>Chaco</strong> <strong>Canyon</strong>;D) processes affecting <strong>Chaco</strong> <strong>Canyon</strong> alluvial record, channel trenching coincides withincreased rainfall; E) archaeology <strong>of</strong> <strong>San</strong> <strong>Juan</strong> <strong>Basin</strong>; F) paleoclimate based onreconstruction <strong>of</strong> vegetation from pollen <strong>and</strong> plant macr<strong>of</strong>ossil data; <strong>and</strong> G) vegetationreconstruction from pollen <strong>and</strong> plant macr<strong>of</strong>ossil data for basin area below 2,000 m.(Taken from Hall 1990:Figure 7.)Evidence from Pack Rat MiddensDuring <strong>the</strong> analysis <strong>of</strong> material excavated fromAtlatl Cave, Earl Neller (1975) recognized <strong>the</strong> value<strong>of</strong> studying pack rat middens to aid in <strong>the</strong>reconstruction <strong>of</strong> <strong>the</strong> paleoenvironment. Thomas R.Van Devender <strong>and</strong> Julio L. Betancourt <strong>of</strong> <strong>the</strong> geosciencesdepartment at <strong>the</strong> University <strong>of</strong> Arizonacollected <strong>and</strong> analyzed macr<strong>of</strong>ossils from 22 pack ratmiddens from four different locations on <strong>the</strong> northside <strong>of</strong> <strong>the</strong> canyon <strong>and</strong> one in Werito's Rincon on <strong>the</strong>south side. Radiocarbon dates were obtained(Betancourt <strong>and</strong> Van Devender 1980, 1981). Theresults <strong>of</strong> <strong>the</strong> macrobotanical analysis provided clues

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