St Louis Frederick's limestone weather for less readily, St Louis weather more readily, Henry Shuck Ford St Louis. St Louis Very Rare Spirorbis intricatus Archaeocidaris with one lower. Orthoceras comus, lower Melinites multiporus Lower Lithothamnium caudatum, everywhere. Lithothamnium proliforunm Lower, everywhere. An Archaeocidaris but smaller in Birdsville, not specified Michelina much larger. Syringopora commun. Mt Sand debahus Trick at that heavy platy Frederick's chest more platy than St Louis chest = rounded nodules Ordo more frequent.