 So, here we are on the cliff face and what's useful about the cliff face is if you look along the stratigraphy, the strata here, we can see layers that are more fossiliferous than others. So, that's probably there were times where we had very quiescent situation where all of the critters were very happy living there and then times of storms when the mud would come down and kill them off and then we'd set a news thing. So we have a record through here of when the glaciers came and the icebergs were doing dropstones, when the Glendonites are popular they seem to be in some stratigraphy here and when things were really abundant.