In the 1970s, the recent publication of an English edition of "The Genesis Flood", the EPM's rejection of flood geology, and Tilney's idiosyncratic scriptural interpretations, led to the formation of rival creationist groups such as the Newton Scientific Association and the Biblical Creation Society. During this time the EPM came to grudging acceptance of flood geology, and a number of young Earth creationists (YEC) joined its council and moved the balance away from Tilney and his allies. It was renamed the Creation Science Movement in 1980. By the mid 1980s it had become overwhelmingly YEC, formally incorporated flood geology into their 'Deed of Trust' (which all officers were required to sign), and condemned Gap and Day-Age Creationism as unscriptural. By the early 1990s it had closed down its foreign branches, but had increased its membership considerably.