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 Carnegie Institution of Washington is deeply in­debted to the United States Geological Survey for its fine co-operation in the work described below. Not only were the services of Mr. Jones made available for a considerable period of time in two successive seasons, but all necessary surveying equipment was provided. We should like most sincerely to thank Dr. W. E. Wrather, Director, and Col. Gerald FitzGerald, Chief Topographic Engineer, for their advice and assistance. Particular thanks go to Mr. J. O. Kilmartin, who acted in a liaison capacity between this Department and the Geological Survey in the original planning of the project and who later assisted in arranging for reproduction of the map. The map of Mayapán discloses a pattern of remains quite distinct from that of any other Maya center so far mapped. Not only is the concentration of structures greater than is known for any comparable area, but the great majority appears to have been dwellings. Because of these apparent differences , it seems advisable to sound a note of caution in making comparisons with other maps. The survey of Mayapán made a particular effort to include all building remains, no matter how small or insignificant . This has been done at no other Maya site, the more imposing ceremonial and civic structures, courts, and plazas having received the lion’s share of attention. Although it is entirely possible, indeed probable, that comparable mapping operations at other ruins would not reveal any such concentration of dwellings as that which occurs at Mayapán, there is nevertheless the chance that remains of this sort would be found in considerable numbers and that the appearance of other maps would thus be altered. Only additional surveys will resolve this uncertainty. H.E.D. Pollock, Director, Department of Archaeology C u r r e n t R e p o r t s Carnegie Institution of Washington Department of Archaeology No. 1 December 1952 [First issued December 4, 1951] Map of the Ruins of Ma yapán, Yucatán, Mexico Morris R. Jones Morris R. Jones  The field work that resulted in the present map covered the periods from November 1949 to June 1950 and from November 1950 to February 1951. Drafting, lettering, and general preparation of copy for reproduction were completed during the summer and autumn of 1951. It was not possible for me to supervise or check the latter phase of the work. I should like to thank Mr. E. M. Shook and Mr. Gustav Strömsvik for their valuable assistance in establishing facilities for operation at the beginning of the project and for their advice in respect to procedures . I should also like to thank Mr. R. L. Roys for his help in the spelling of local Maya names, mainly those dealing with cenotes. The wholehearted co-operation extended to me by Mr. H.E.D. Pollock was a major contribution to the completion of the project. Telchaquillo, a small village 2 km north of Maya­ pán, was selected as a base of operations. The village is accessible from Merida by road, and proved to be a good location, mainly because of proximity to the ruins and the fact that the native labor supply in the village was both adequate and of good quality, the natives being interested in, and sympathetic with, the project as work progressed. Reconnaissance and survey at Mayapán during 1938 by Mr. R. T. Patton (CIW Year Book 37:141–142) proved valuable in planning operations. Several facts were known about the site. The ancient city is surrounded by a wall, roughly oval, extending approximately 3,200 m east-west and 2,000 m northsouth , the area outlined being 4.2 sq km. Ancient gateways are to be found at intervals along the wall. A large pyramid, many closely spaced colonnades, small pyramids, and three round towers form a main group a little west of the center of the walled area. Another rather small ceremonial center is just inside the eastern limit of the area. The wall presented a distinct advantage in the making of the map because it forms a definite boundary , and during the course of the work exploration and mapping were limited to about 75 m outside the wall. Ruins were found within this outer fringe, and it is known that more are beyond it, but they are sparse and hardly worth the effort of mapping when so much lies within the primary area. A scale of 1:2...

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