Viva, Lincoln, and Evan went back inside. I decided to quit using a chisel and just hammer directly on one of the larger geodes. I quickly cracked one open! At this point I didn't care that it wasn't two nice halves. Bentley and Jake cracked/shattered one large geode each. I convinced Lincoln, Evan, and Viva to give it another go. They had good luck, too.
The smaller geodes were not easy to crack open. Only one, possibly two of them, had any empty cavity in them. The rest were solid which means they were not geodes since by definition a geode is any HOLLOW nodule. I was not at all happy with the smaller geodes, but Jake and Bentley had a great time hammering away at them.