|Area||Paleo-water depth (m)|
|Marginal area where the strata synchronous to the Guanyinqiao Layer is absent||0|
|Underwater highland deposited in the Paraorthograptus pacificus and Metabolograptus extraordinarius zones with the absence of the Guanyinqiao Layer and the Wufeng Formation||5|
|Underwater highland deposited in the Metabolograptus extraordinarius zone with the absence of the Guanyinqiao Layer and the Wufeng Formation||10|
|Area where the Guanyinqiao Layer containing the shallow-water Hirnantia was deposited||10–30|
|Area where the Guanyinqiao Layer containing the deep-water Hirnantia was deposited||30–60|
|Area where the black shale was continuously deposited||60–100|
|Area where the Tianmashan and Tianlingkou formations were deposited||60–80|
|Area where the Daduhe and Tiezufeike formations were deposited||10–20|
|Area where the Nanzheng Formation was deposited||10–30|
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