 The site's butterfly fauna in mentioned as in its citation sheet.Twenty-five species are known to breed, including colonies of silver-spotted skipper and Duke of Burgundy, together with comparatively large populations of brown argus, green hairstreak, chalkhill blue, marbled white and dingy skipper.The structural picture is similar to that at Winchester to the west, with an east-west trending anticline in the upper chalk (the Winchester-East Meon Anticline) cut through by a south-flowing river to expose an inlier of middle and lower chalk.