Discovery of Cretaceous Mammalia, Part 3
Discovery of Cretaceous Mammalia, Part 3
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白垩纪哺乳动物的发现，第 3 部分
DOI：
10.2475/ajs.s3-43.255.249
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发表时间：
1889
影响因子：
2.9
通讯作者：
O. C. Marsh
中科院分区：
文献类型：
--
作者：
O. C. Marsh
在 1889 年 7 月的这本杂志中，作者宣布在怀俄明州拉勒米发现了各种奥雷泰科哺乳动物遗骸，并对一些保存最完好的标本进行了图示和简要描述。在接下来的编号中，这个主题继续进行，并描述了更多的遗骸。*从那时起，在同一地点和其他地点进行了系统的探索，目前，有一千多个标本可供检查。这些化石都是支离破碎的，但它们为我们了解这种奇特的动物群提供了相当多的线索，表明它的数量仍然有限，但比最初的发现所表明的更加多样化。所有发现的哺乳动物体型都很小。它们主要是中生代类型，与下面的侏罗纪类型比上面的第三纪类型更接近。食肉动物、啮齿动物和有蹄类动物似乎仍然缺乏这一视野，而真正的食虫动物尚未被确定。 .Allotlteria 数量最多，最近的发现进一步证明了该类群与现代 1Vionotremes 密切相关（即使不是它们的祖先）。 Oimole8tidm 是现存负鼠的一个近亲科，其数量尤其丰富，在遗骸中似乎也有其他有袋动物的身影。本文是该系列的第三篇文章，简要描述了来自同一地平线的其他样本，并对这些样本和许多其他样本进行了仔细的整理。在以后的交流中，将考虑这些形式彼此之间以及与中生代和第三纪哺乳动物的关系。并对整个主题进行了充分的讨论。
IN this Journal for July, 1889, the writer announced the discovery of various remains of Oretaceolls mammals in the Laramie of Wyoming, and gave figures and brief descriptions of some of the best preserved specimens. In the following numbel., the subject was continued, and additional remains were described.* Since then, systematic explorations have been made in the same and other localities, and, at the present time, more than a thousand specimens are available for examination. These fossils are all fragmentary, but they throw considerable light on this peculiar fauna, showing it to be as yet limited, but more varied than the first discoveries indicated. All the mammals found are small in size. They are mainly Mesozoic in type, and more nearly related to the Jurassic forms below than to those in the Tertiary above. Oarnivores, Rodents, and Ungulates, still appear to be wanting in this horizon, and true Insectivores h<j,ve not yet been identified with certainty. The .Allotlteria are most numerous, and the evidence that this group is closely related to the modern 1VIonotremes, if not their ancestors, has been strengthened by the discoveries recently made. The Oimole8tidm, a family allied to the existing Opossums, are especially abundant, and other Marsupials appear to be represented among the remains secHl·ed. In this paper, the third of the series, additional specimens from the same horizon are briefly described, and these and many others are carefully figlli·ed. In a later communication, the relations of these forms to each other and to allied Mesozoic and Tertiary mammals will be considered. and the whole su bject fully discussed.