Acoustic density

Gardner (Anhydrite, Basalt, Chalk, Claystone, Coal, Dolomite, Halite, Limestone, Marl, Mudstone, Sandstone, Shale, Siltstone)

0.23 in g/cm³

1000000 in μs/ft

where DTCO is the acoustic (P-wave) travel time in ms/ft

Bellotti (Anhydrite, Basalt, Chalk, Claystone, Coal, Dolomite, Halite, Limestone, Marl, Sandstone, Shale, Siltstone)

2.75 in g/cm³

2.11 in g/cm³

200 in μs/ft