The modern distribution of the western pond turtle (Actinemys marmorata) is discontinuous, with a historic but extirpated population in the Puget Sound region that was isolated from populations south along the Columbia River. To better understand this distribution, a review of the archaeological literature for the Puget Sound region was conducted to determine the prehistoric biogeography of the species in the Puget Sound area. Western pond turtles are nearly absent from the regional archaeological record, represented at best by four tentative specimens. This may be explained by extremely low population levels throughout the Holocene at the northernmost extent of its range.

中文翻译：

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普吉特海湾地区西塘龟（Actinemys marmorata）的考古学和生物地理学

西部池龟（Actinemys marmorata）的现代分布是不连续的，在普吉特海湾地区有历史但已灭绝的种群，该种群与沿哥伦比亚河南部的种群隔离。为了更好地了解这种分布，对普吉特海湾地区的考古文献进行了回顾，以确定普吉特海湾地区该物种的史前生物地理分布。区域考古记录几乎没有西部池塘龟，最多只由四个暂定标本代表。这可能是由于全新世范围内最北端的人口极低。