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Table 1 The strata

From: Predicting the distribution of ground fissures and water-conducted fissures induced by coal mining: a case study

Stratigraphic unit Coal seam and layer Floor depth (m) Thickness (m)
System Formation
Quatemary   Aquifer 25.96 25.96
Neogene    42.38 16.42
Aquifuge 49.70 7.32
Permian \(\hbox {P}_{2}\)s   74.70 25.00
\(\hbox {P}_{1}\)x   124.27 49.57
\(\hbox {P}_{1}\)s   183.88 59.61
Carboniferous \(\hbox {C}_{3}\)t 4# Coal Seam 195.88 12.00
  263.64 67.76
\(\hbox {C}_{2}\)b   302.17 38.53
Ordovician    702.17 400.00