The study of Quaternary glaciation is to deduce their landform genesis, ages and environmental indication by meticulous logical reasoning mainly based on observed geomorphologic and sedimentological features as well as obtained chronological results. Identification of the “glacial relics” in Mengshan Mountain was established by inappropriate and even incorrect evidences, resulting in the invalid snow line reconstruction and ice age division. The so- called quaternary glacier relics can be adequately explained by non- glacial genesis. Based on the field investigation of the depositional and erosional landforms in Mengshan Mountain, the authors found that: （1）The Lanmaqiang levee, with typical standing stones and stacked boulders, is discontinuously and asymmetrically distributed on the cutbank at downstream Lanxi Valley; its depositional features including gravel fabric, imbricate structure, muddy bottom and irregular scratches of boulder can be definitely attribute to a debris- flow genesis. （2）The Lanxi Valley is a typical V- shaped valley without clear facet and chatter mark on the valley wall; the non- glaciogenic scratches were sculptured by the rolling boulder entrained in the debris flow. （3）The “chatter marks” reported in Mengshan Mountain is inconformity with the definition and formation mechanisms of chatter mark, which means it is an invalid evidence to glacier relics. This study suggested that using the term chatter mark to describe all the glacial erosional landforms with microscale crescentic features. There are lots of logical fallacies in the paper “Types, characteristics and dating data of glacial relics in Mount Mengshan Geopark, Shandong Province”(Wang Zhaobo et al., 2019&). Taking the paper as an example, this study listed 6 of logical fallacies involved in the paper and pointed out their irrational causes.