Abstract
During the spring of 1924 Dr. C. A. Matley sent to the United States National Museum specimens of larger foraminifera and corals collected by him in the Cayman Islands. A few months later the collection was forwarded to me for examination and report, and in July, 1924, I sent to Dr. Matley a preliminary report. Nothing more regarding the corals need be said than was contained in my report to him; but it is desirable to accord more detailed treatment to the foraminifera, because the species represented, though already known, have not been adequately described and figured in any prior publication, and, in this connexion, an opportunity is offered to make clear a part of the basis of the correlation of an important geological horizon in the Gulf and Caribbean region of America. It is also pertinent to discuss a part of the technique in the study of larger foraminifera, and perhaps thereby render assistance to those who are studying the group, but have not yet become proficient. Since this paper is intended primarily as a contribution to geological correlation, a note on what I have considered the proper procedure in the study of the American Tertiary formations may be appropriate. It is my belief that the first endeavour should be the correlation of the American deposits among themselves, and that, after this object has been achieved, correlation with more distant regions should be undertaken. Knowledge of the many horizons recognizable in the American Tertiary deposits is very inadequate, notwithstanding

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