National Natural Landmark locations and attribute information were obtained from the Resource Management Specialist at the Midwest Regional Office of the National Park Service (NPS). Additional information about the National Natural Landmark program can be obtained from this office located at 1709 Jackson Street, Omaha, Nebraska 68102-2571; (402) 221-3418.
"The National Natural Landmarks Program recognizes and encourages the conservation of outstanding examples of our country's natural history. It is the only natural areas program of national scope that identifies and recognizes the best examples of biological and geological features in both public and private ownership. National Natural Landmarks (NNLs) are designated by the Secretary of the Interior, with the owner's concurrence. To date, fewer than 600 sites have been designated. The National Park Service administers the NNL Program, and if requested, assists NNL owners and managers with the conservation of these important sites."
This data set was compiled by Bernardin-Lochmueller and Associates, using data believed to be accurate; however, a degree of error is inherent in all data. This product is distributed "AS-IS" without warranties of any kind, either expressed or implied, including but not limited to warranties of suitability of a particular purpose or use. No attempt has been made in either the designed format or production of these data to define the limits or jurisdiction of any federal, state, or local government. These data are intended for use only at the published scale or smaller and are for reference purposes only. They are not to be construed as a legal document or survey instrument. A detailed on-the-ground survey and historical analysis of a single site may differ from this data.
U.S. National Park Service - National Natural Landmarks Program (NNLP)
The Hemmer Woods landmark boundaries were not clear on the map provided by the NPS. Data pertaining to state-managed lands from the Indiana Department of Natural Resources (IDNR) was used to provide further information on the boundaries for Hemmer Wodds. this property is noted for special consideration to be addressed in future review by NPS.
Marengo Cave is another landmark where no clear boundaries were shown on NPS map. Three caves, two in addition to Marengo Cave (Old Town Spring Cavern and Slush Tube Cave), were noted on the map. Polygons were manually drawn to encompass each cave, but all are listed as Marengo Cave with a subunit name if necessary. It is uncertain if the additional two caves are included in the National Natural Landmark program and therefore the true area of the landmark is not correct. This property is also noted for special consideration for future review by the NPS.
The Hemmer Woods landmark boundaries were clear on the map provided by the NPS. Certain assumptions were made to create this polygon. The Hemmer Woods boundary was updated from the previous version of this file.
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