excel graph, please help.

[Thomas. PLease.]

So i'm trying to do some coursework, which involves plotting the finding of an earth core sample. So i'm able to draw graphs, but really i need the depth going down the y axis, starting with 0 at the top, and ending at the deepest depth. And the the x axis to have the percentage of findings at the certain depths. I've drawn a basic diagram of what I want but i'm not sure how to get there. Using office 2007.

Thanks very much for any help, tom.

 

[Antar Bolaeisk]

You can format the axis and have the scale in reverse.

You'll also have to set the X-axis crossing at the highest value on the Y-axis.