Lithology sense of displacement across the zone. In igneous rocks, small-scale structures are mostly observed in lavas such as pahoehoe versus ʻAʻā basaltic flows, and pillows showing eruption within a body of water or beneath ice. Unconsolidated surficial materials may also be given a lithology. This is defined by grain size and composition, and is often attached to an interpretation of how the unit formed. Surficial lithologies can be given to lacustrine, coastal, fluvial, aeolian, glacial, and recent volcanic deposits, among others. Examples of surficial lithology classifications used by the US Geological Survey are, "Glacial Till, Loamy", "Saline Lake Sediment", and
Zhao Wenzhi University. He served two terms (2001–2011) as chief scientist of natural gas project of the State Basic Research Program of China (also called 973 Program). Zhao organized the study of lithology-related oil/gas accumulation theory and evaluation technology from 1997 to 2005, focusing on hydrocarbon accumulation with large scale in the flat and tectonic low areas in faulted sag-type, depression-type and foreland-type sedimentary basins. He has established the theory of large-scale lithology-related oil/gas accumulations with medium-low abundance, which helps to expand the exploration activity from the limited structural highs to the wide-ranged depressions. As a result, abundant oil and gas reserves