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A few weeks ago, I picked up a couple bags of ground rocks from Arizona Rock & Mineral Company. After comparing many different colors in person at the local hobby shop, I settled for their Cajon bags in the picture. The color is meant to match the ground color of Santa Fe's Cajon Pass east of LA. Having visited the area years ago to photograph trains, I felt this looked suitable for a generic Western game. The Sand & Gravel bag has textures ranging from fine powder to larger bits. The Rip Rap will be for those occasional large stones.
Check their website. They have some great products, especially if you want to do adobe houses in a deep brownish red color. Good stuff!