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A Geologic Odyssey: From Field Curiosity About Nodules to Technical Abstract

Developing geologic ideas about fault-related calcium-carbonate nodules, progress toward better understanding of natural phenomena
By Dave Love and Mike Whitworth

Observations of calcium-carbonate-cemented sandstone nodules adjacent to fault scarps south of Albuquerque leads to asking: What is the origin of these nodules?

Cemented nodules weathering from carbonate-coated sand down-gradient from fault
(locality 1 of geologic stetting)
(click image to zoom)

Cemented tubular sandstone suggesting horizontal fingered flow
(nodule 2)
(click image to zoom)

Cemented sandstone suggesting anastomosing three-dimensional flow
(nodule 3)
(click image to zoom)

Cemented tubular sandstone with calcified root mat preservation
(nodule 1)
(click image to zoom)

Organizing the Odyssey:

  1. Definitions
  2. Geologic setting
  3. Field observations
  4. Laboratory observations
  5. Hypothesis
  6. Using the hypothesis to develop a semi-quantitative model to test the hypothesis
  7. Discussion and variations
  8. Abstract
  9. References