Abstract This article describes, classifies, and provides the calculated ages of 14 basally thinned and fluted points of obsidian in the Borden collection from Rose Valley in southern Inyo County, California. With the exception of one item of Fish Springs obsidian, the specimens are all made of glass from geologic subsources in the Coso Volcanic Field. Typologically, the fragmentary and reworked artifacts appear to represent Clovis, or perhaps Clovis-derived, concave-base lanceolate points. Obsidian hydration measurements permit age calculations that range between approximately 13,793 and 11,308 calendar years ago. The calculated ages of the Borden artifacts are consistent with their discovery on landforms associated with Younger Dryas and very early Holocene wetlands. Our research results also suggest that Clovis technology may have persisted longer in California than it did in the southeastern, central, and southwestern United States.

中文翻译：

---

加利福尼亚州阿尔塔因约县 Borden 藏品中黑曜石的凹槽和基底变薄的凹面基点：年龄和意义

摘要 本文描述、分类并提供了加利福尼亚州因约县南部玫瑰谷的 Borden 藏品中 14 个基底变薄和有凹槽的黑曜石点的计算年龄。除了一件鱼泉黑曜石外，所有标本均由来自科索火山区地质子源的玻璃制成。在类型学上，碎片和重新加工的文物似乎代表克洛维斯，或者可能是克洛维斯衍生的凹底披针形点。黑曜石水合测量允许计算大约 13,793 到 11,308 历年前的年龄。Borden 文物的计算年代与他们在与新仙女木和非常早期全新世湿地相关的地貌上的发现一致。