The excavations dug through of infilling consisting of 26 main sediment layers. The stratigraphy, mineral compositions and surrounding volcanology suggests an infilling island arc basin. The basin appears to have subsided concurrently with sediment infilling. Wherever a subglacial tunnel began infilling, long winding formations known as eskers would form. Decommissioning and infilling septic tanks is also mandatory. The brick and stone infilling of the ground floor is later. In addition to infilling, taxidermy specimens may require structural repairs. The responsibility for infilling the walls usually belonged to the tenants. In exchange for of the Esplanade, the railways underwrote the infilling of the harbour. More recent work had also began on infilling the huge Cathedral Gallery with loose sand. They practice laying on of hands and seek the "infilling" of the Holy Spirit. They stand partially on ground formed by the artificial infilling of the old harbour mouth. The building and infilling continued into the Edwardian era. After the 1980s there had been a huge infilling around South Normanton. Infilling development may join the two urban areas together.