宁夏固原古近系寺口子组砂岩成因探讨
*
杨帆
1,
2
, 李孝泽
1
Discussion about origin of the Paleogene Sikouzi Formation sandstones in Guyuan,Ningxia
Yang Fan
1,
2
, Li Xiaoze
1
宁夏固原寺古近系口子组砂岩石英颗粒表面特征 A、B—虚线内为V形撞击坑;B、E—箭头所指为水下磨光面;C—虚线内为新月形撞击坑;D—虚线内为碟形撞击坑;F—棱角状形态,虚线内为流水擦痕