1A Limestone Dust Finest Limestone dust for leveling and compaction (more info) 1B Limestone 1B Limestone is the small clean limestone chip that is 3/4" inch in size (more info) 2A Limestone 2A Limestone is 1" to 2" stone mixed with the limestone dust and sand for compaction and is used as base material or on driveway appliions. (more info) 2B Limestone 2B Limestone is the clean 1" to 2 ...