Breccia. A. Block of breccia used in the Apollo Sanctuary; the clasts sizes ranges from a few centimeters to 30 centimeters; clasts of the two subfacies of the Parnassus limestones can be observed (1 for the wackestone, 2 for the oolitic grainstone). B. Microscopic view showing the limestone clasts (1 for the wackestone, 2 for the oolitic grainstone) in a clay matrix. Red, white and black rectangles on the scale represents 1 cm.