High-reflectivity anomalies in the near infrared (1.0 to 2.6 µm) have been observed on scanner images obtained by the Environmental Research Institute of Michigan (ERIM) in flights over several geologic units in southern California and southwestern Nevada and by the Skylab II mission in flights over western Nevada. These anomalies almost always occur in rocks that are at least as mafic as andesite. The most reasonable explanation for the anomalies is that the anomalous materials have a 5-µm or finer coating of hematite that was formed during cooling and posteruptive fumarolic steaming.

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