silt bed造句

• The ash is washed into a silt bed and combined with the lava, dirt and stone on the ground already.
• The archaeologist Major Gordon Fowler explained these are due to the extensive drainage of the fens, and " differential shrinkage " of the silt bed and the surrounding peat.
• That would have caused the river to go underground in the gravel of the Munich floodplain, but due to the formation of a silt bed caused by the stream itself, it only goes underground just north of Ostpark at the borders of the districts of Perlach, Ramersdorf and Berg am Laim.
• On one trip, Deffeyes picked up a piece of Triassic shale near Paterson, New Jersey to demonstrate a common geologic field-test : he put the shale in his mouth and chewed it . " If it's gritty, it's a silt bed, and if it's creamy it's a shale, " Deffeyes said.