so with a couple of geological training behind him and a little more in zoology and botany, darwin went out and this was the actual map of the formations in england that he had with him aboard ship. you can see on the upper left hand side of this map, it's a folding map, are different colors. they stand for different formations. and what we call the geological column is just getting developed at this period so that the colors of the bottom, the little ticks at the bottom, those would be the oldest formations and the ones at the top of the column, those would be the youngest formations and then they would -- you'd color the exposures, which formation was atop of the surface and could be seen when you went through an area so that was the sort of tradition in which darwin was given to train. now, let's run through on what he did on the beagle voyage according to the henslow rubric of collecting anything worthy and collecting, darwin collected about 2,000 geological specimens during the five years that the beagle voyage was out. this is not really a huge number. some of you saw the article