2009年秋季至2010年春季,北京大学考古文博学院与郑州市文物考古研究院合作发掘河南省新密市李家沟遗址,发现距今10500年至8600年左右连续的史前文化堆积。在堆积下部发现属于旧石器时代末期的典型细石器与局部磨制石锛陶片共存;中部则发现以压印纹粗夹砂陶与石磨盘等为代表的早期新石器文化;最上部是典型裴李岗文化遗存。 From autumn 2009 to spring 2010, the Institute of Archeology and Museology, Peking University and Zhengzhou Institute of Cultural Relics and Archeology jointly explored the Lijiagou site in Xinmi City, Henan Province, and found that there was a continuous accumulation of prehistoric cultures from about 10500 to about 8600 years ago. In the lower part of the accumulation, the typical fine stoneware belonging to the Paleolithic era coexisted with the locally-polished stone and pottery, the early Neolithic culture represented by embossed coarse sand-sand and stone discs, etc., and the upper part was typical Pei Li Gang cultural relics.