I gave this talk at Camp Brotherhood in July 2010.
The Geology of Sculpting Stone: Indiana Limestone
This link ties to this presentation. It is a narrated powerpoint version for download. It's big (19 Meg) so after you click on "The Geology of Sculpting Stone: Indiana Limestone" link above please you be patience as it is downloaded. Once downloaded, I suggest you open the presentation and click on the "Slide Show" tab then "View From the Beginning" to hear my associated narration.
The presentation covers: