 After that time due to human alteration of geologic factors, such as the sedimentation rate, the delta has been degrading and the coastline subsiding, resulting in ongoing contemporaneous crises in the city of Venice, where much irreplaceable art and architecture is likely to be lost due to soaring sea level in the next centuries.Where the land surface now dips below sea level the river must run at a relative elevation between dikes.The Malossa gas condensate field was discovered in 1973 and produces at depths of from the Upper Triassic Dolomia Principale dolomite and the Lower Jurassic Zandobbio dolomite, capped by the Lower Cretaceous Marne di Bruntino marl.