“残积层”用英语怎么说？

残积层钽铁矿: 残积层钽铁矿发现于由碎片和小鹅卵石成分的碎矿中.Eluvial tantalite: Eluvial tantalite is found in rubble consisting of fragments and pebbles of varied composition....

“残积层”的拼音为：cán jī céng...