However , the authors discovered recently that the top and bottom surfaces of the loushanguan formation are palaeokarst unconformity interfaces , and there are a lot of interbeds of granular ( oolite , pisolite and oncolite ) dolomite and algae - mat dolomite , especially sedimentary structures such as the bird ? s eye , stromatolite , cross bedding and tepee structures 但笔者新近研究发现，其顶、底均为古岩溶不整合面，并有大量颗粒(鲕、豆、核形石)白云岩和藻纹层白云岩夹层，还有许多鸟眼构造、叠层石构造、交错层理、帐蓬构造存在。
The time corresponding to the four parts along the section are as follows : the top lake - swamp sediments : holocene ; the uppart fine sand : later late pleistocene ; the middlepart sandy clay : middle - early late pleistocene ; the lowpart clayer silt : later - middle - pleistocene . the fossils and stone artifacts found in salawusu site should be formed during the last but one glacier , its age range is about 0 . 13 - 0 . 19 ma , and belongs to later middle - pleistocene 分析q曲线与氧同位素曲线的一致性以及以上研究结果，包含萨拉乌苏地层的这套沉积物的沉积时代为：顶部湖沼相沉积物：全新世；上部具交错层理的细砂：晚更新世晚期；中部粉砂质粘土：晚更新世中期至早期；下部粘土质粉砂：中更新世晚期。
These internal - tide deposits can be classified into four basic types according to their features , i . e . , bi - directional cross - laminated fine - grained sandstone , unidirectional cross - bedded and bidirectional cross - laminated medium - grained to fine - grained sandstone , rhythmic thin alternating beds of sandstone and mudstone , and oolitic limestone 这些内潮汐沈积进一步划分? 4种类型：双向交错纹理细砂岩型、单向交错层和双向交错纹理中细砂岩型、韵律性砂泥岩薄互层型和鲕粒灰岩型。
