Correlating the tops and bottoms of units in order to map geology is standard practice in hydrogeology. However unless there are a lots of wells/bores to use, the result is both uncertainty and flat surfaces devoid of structure and complexity.

Below is a real example taken from the Windermere Trough in Victoria. There is only one well/bore available for correlation so formation boundaries are both inaccurate and lacking in detail of structure and internal lithology.

Pancake geology derived from insufficient dataContrasted with this image based on seismic interpretation showing the role of structure in controlling aquifer thickness and connectivity. Internal aquifer geometry (see the prograding sands within the Pebble Point Formation), as well as indication of the lithology of the Dilwyn Formation.

Geofabric showing structure, internal formation geometry, lithology and unit connectivity