The sale in New York comes after the planned auction of a larger T. rex specimen, estimated to sell for $15 million to $25 million, was scrapped by Christie’s in Hong Kong after questions were raised about how much real dinosaur bone was included.The questions about the Christie’s T. rex specimen, nicknamed Shen and put up for auction by an anonymous consignor, revolved around how much of the skeleton was replica bone from another dinosaur — a common practice when mounting skeletons.The replica bones used in Shen were casts from a famous specimen, named Stan, which broke a record for fossil sales when it fetched $31.8 million at a Christie’s auction two years ago, supercharging the industry.Buyers were told by the auction house that the skull “contains 30 bones of the approximate total of 39 bones,” and they were given a diagram of a skull with the real bone coloured in.The skull, which weighs more than 200 pounds, was discovered on private land in an area of northwestern South Dakota known for being rich with fossils, the auction house said."