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首页> 外文期刊>Geoarchaeology >Rethinking the fourth of July Valley Site: A study in glacial and periglacial geoarchaeology
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Rethinking the fourth of July Valley Site: A study in glacial and periglacial geoarchaeology

机译：反思七月四日谷地遗址：冰川和冰缘地球考古学研究

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The Fourth of July Valley site (5BL120) occupies the crest and inner slope of a Satanta Peak (latest Pleistocene) terminal moraine above timberline in the Indian Peaks Wilderness Area, Colorado Front, Range. Excavations in 1971 suggested that a Late Paleo-Indian lithic tradition marked by lanceolate and stemmed projectile points with parallel-oblique flaking persisted at high altitude during the Altithermal, long after its disappearance from drought-susceptible lowlands. Analysis of a sediment. column collected in 2001 casts doubt, on this intierpretation. Large charred sclerotia (die resting stages of mycorrhizal fungi) show that, tree islands colonized the moraine soon after deglaciation, fueling Early and Middle Holocene wild-fires. Conditions became incrcasingly periglacial ca. 3340 yr B.P., when a lobate rock glacier advanced to the south margin of the site, altering snow-accumulation patterns, eliminating trees, supplying meltwater that fueled ice-lens formation, and initating deposition of humus-rich, snowbed loess. Large waste flakes and artificats were frost-sorted to the existing ground surface, where they became mixed with 6240-year-old wildfire charcoal in a pseudo-occupation layer. Microflakes were too small to participate in vertical frost sorting, so remained in their original stratigraphic locations. The association of thermally altered microflakes with 8920-year-old charcoal in a deeply buried stratigraphic context suggests that the site was occupied during die Early Holocene and is irrelevant to the Altithermal refugium hypothesis. (c) 2005 Wiley Periodicals, Inc.
机译：七月四日谷遗址（5BL120）占据了科罗拉多峰前山脉印第安峰荒野地区林线上方的萨塔塔峰（最新更新世）终端冰ora的波峰和内坡。 1971年的发掘表明，在高原地区，高度易受干旱影响的低地消失了很长时间后，以披针形和茎状发射点以及平行斜片剥落为特征的古印度晚期石器时代传统就一直存在于高海拔地区。分析沉积物。 2001年收集的专栏文章对这种解释提出了怀疑。大型烧焦的菌核（菌根真菌死于静息阶段）表明，在冰消融化之后，树岛很快就在冰ora上定居，加剧了全新世早期和中期的野火。情况逐渐变成冰缘。公元前3340年，当叶状岩石冰川前进到该地点的南边缘时，改变了积雪模式，消除了树木，供应了促使形成冰晶的融化水，并导致了腐殖质丰富的雪床黄土的沉积。将大块的薄片和人工制品按霜分类到现有地面上，在其中与伪装层中的6240年历史野火木炭混合。微粒太小，无法参与垂直的霜分选，因此仍保留在其原始地层位置。在深埋的地层背景下，热蚀的微薄片与8920年的木炭的联系表明，该位置在全新世早期就被占领了，与Altithermal Refugium假说无关。 （c）2005年Wiley Periodicals，Inc.

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