You should contact the Colonial Williamsburg landscape dept. They have been using marl (oyster shell) pathways for years and can give you a very precise idea of its performance and associated costs. They have extensive experience and have been researching options for road surfaces that have light vehicular traffic and carriages with iron-shod tires (the iron tires wear down the road, particularly in the summer heat). Cheers! Dave David Harvey Artifacts 2930 South Birch Street Denver, CO 80222 303-300-5257 [log in to unmask] ========================================================= Important Subscriber Information: The Museum-L FAQ file is located at http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed information about the listserv commands by sending a one line e-mail message to [log in to unmask] . The body of the message should read "help" (without the quotes). If you decide to leave Museum-L, please send a one line e-mail message to [log in to unmask] . The body of the message should read "Signoff Museum-L" (without the quotes).