The Oldest Metazoa in the World

最近，人们对软体动物的印象 年在腰带超群的USNM收藏中发现， 冰川国家公园。 现有的材料太少，太差 保存下来，以令人信服地证明这些标记是 后生动物起源 探索性实地工作将在 博物馆收藏的地方，希望 寻找这些可能的后生动物的更确定的标本。 如果这些标本确实代表后生动物， 已知最古老的动物将从大约700年延长到1400年 百万年。

Recently, impressions of what may be soft-bodied animals have been discovered in USNM collections from the Belt Supergroup in Glacier National Park. Existing material is too scanty and poorly preserved to convincingly document that the markings are of metazoan origin. Exploratory field work will be conducted in the area from which the museum collections were made, in hopes of finding more definitive specimens of these possible metazoans. If the specimens do indeed represent metazoans, the age of the oldest known animals would be extended from about 700 to 1400 million years.