Denver Terra Cotta West 1st and Umatilla, Race 4643 Mr Marks, ceramist Plastic Siding -- Near of Lorenzic Ridge. Tom Bell. -- Sand Moffett RdR. Purchase fire clay siding -- (This more plastic - than most of other fire clay.) Purchase -- Indicate clay. Cost of body is clay, best grog -- use about ? > 1800 tons per year. From 12 to 15000 -- in good year. -- The Lorenzic clay, while plastic has quite ebit 6 to 32% very fine silt. Limit on non-plastic body is 25% 11.