为了探索古豳地的历史文化渊源，西北大学文化遗产学院在泾河流域陕西段开展旧石器考古调查。2020年10月，在长武、礼泉、泾阳三县新发现15处地点，获得石制品298件。这些地点集中分布于泾河右岸第四级阶地上部，石制品原料以优质石英岩为主，来源主要产自河流阶地底部的砾石层，石制品表面普遍有一层黄土钙质结核层。石制品类型包括石核、石片和刮削器等，文化面貌总体上属于中国北方地区石片石器工业。调查发现的向心剥片石核、加工精致的刮削器及对称性较高的盘状石核等，显示石器技术具有一定的进步性。石制品主要埋藏于马兰黄土层中MIS 3沉积阶段，对应末次冰期中气候相对湿润的阶段，初步推测早期人类在泾河中、下游生存活动的时代不晚于晚更新世。

In October 2020, an investigation along the Jinghe River valley in Shaanxi Province was carried out by the School of Cultural Heritage at Northwest University. A total of 15 localities were newly discovered in Changwu, Liquan and Jingyang counties. Almost 300 stone artifacts were buried in the 4th terrace of the right bank of the Jinghe River with some artifacts also surface collected. Raw materials were procured from gravels at the bottom of this terrace. High quality quartzite dominates the raw material. Almost all surface lithics were covered by a thin calcareous concretion. Most stone artifacts were manufactured by free hand hammer percussion, followed by bipolar technique. Technologically, the stone artifacts can be classified into cores, flakes and scrapers, etc. The lithic assemblage is assigned to the flake tool industry of North China, while centripetal exploitation cores, deeply modified scrapers and a high degree symmetry discoid show obvious advanced flaking technique. Judging from the artifacts buried in the Malan Loess (corresponding to MIS 3), the age of this early human occupation from the middle to lower reaches of the Jinghe River is no later than Late Pleistocene.