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<ul><li>Single tors, tor clusters and tor fields are  </li></ul><ul><li>common in the Great Falls Metagranite  </li></ul><...
 
Large tor showing exfoliation and jointing.
Tor cluster on steep slope that has collapsed.
Boulders (Tors) along the river, vertical jointing at the right.
 
 
Sea level fluctuations resulted in greater erosion  and down cutting,  removed saprolite along steep slopes exposing wides...
Topographic map of area river diverted below Fishing Creek Dam. <ul><li>. </li></ul>
Aerial photograph 2004  contour interval = 2 feet Cont. at right
South end of long bypass.
Erosion and Weathering During Pleistocene River Entrenchment Exposed Numerous Tors (Boulders).
The Exposed Nitrolee Riverbed   Pictures Showing Diversity of Rock Exposures.
Exfoliated Granite Exposed in Middle of River Bed, Facing Southeast.
Exfoliation in Granite, Rounded by Water Flow.
River Bed Looking North.
Exfoliation dome.
Exfoliation dome.
 
 
Looking south.
 
Granite Pavement in Middle of Exposed River Bed.
 
Round granite boulder that rolled from steep slope into the river.
Very large tor perched on cliff.
Tor, Possibly Rolled Onto Rock Pavement. Large pavement outcrop.
Two large round tors that may have rolled from steep slope into the main channel note base altered by water flow.
Rock smoothed by river flow, note water level change . Anvil rock - a pedestal rock  undercut by flowing waters.
Anvil rock - a pedestal rock undercut by flowing waters.
Large  pedestal  undercut by water flow.
Excellent pedestal rock in main river channel Nitrolee riverbed.
Details of layered meta granite  texture  on a water  polished  surface.
Metagranite (light) and metadiorite?
Weathered sheared metagranite, off Brooklyn Road.
Granular texture in an altered metagranite .
Mafic dikes have been intruded into the granite, they contain minerals that are more water soluble, therefore, are weather...
A dike intruded into metagranite. Location is a roadcut above the river near Dearborn dam. Rocks here are weathered to sap...
Vertical Mafic Dikes Injected Into the Metagranite.
Mafic  dike offset by faulting.
Contact of mafic dike and granite.
Knife edge contact. Mafic dike Metagranite Brunton compass for scale.
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catawba river geology

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catawba river geology

  1. 2. <ul><li>Single tors, tor clusters and tor fields are </li></ul><ul><li>common in the Great Falls Metagranite </li></ul><ul><li>especially along the steeper slopes along drainage draws and along the slopes of most creeks flowing into the Catawba River. </li></ul>
  2. 4. Large tor showing exfoliation and jointing.
  3. 5. Tor cluster on steep slope that has collapsed.
  4. 6. Boulders (Tors) along the river, vertical jointing at the right.
  5. 9. Sea level fluctuations resulted in greater erosion and down cutting, removed saprolite along steep slopes exposing widespread single and multiple corestones. Tors on the divides are embedded in saprolite, upper tors collapsed onto the lower ones in the larger fields.Cascades, rapids and falls formed at several locations where tor fields and large near surface bedrock exposures were exhumed. The Great Falls Of The Catawba dropped about 35 meters, the river about 54 meters in a distance of 13 kilometers..
  6. 10. Topographic map of area river diverted below Fishing Creek Dam. <ul><li>. </li></ul>
  7. 11. Aerial photograph 2004 contour interval = 2 feet Cont. at right
  8. 12. South end of long bypass.
  9. 13. Erosion and Weathering During Pleistocene River Entrenchment Exposed Numerous Tors (Boulders).
  10. 14. The Exposed Nitrolee Riverbed Pictures Showing Diversity of Rock Exposures.
  11. 15. Exfoliated Granite Exposed in Middle of River Bed, Facing Southeast.
  12. 16. Exfoliation in Granite, Rounded by Water Flow.
  13. 17. River Bed Looking North.
  14. 18. Exfoliation dome.
  15. 19. Exfoliation dome.
  16. 22. Looking south.
  17. 24. Granite Pavement in Middle of Exposed River Bed.
  18. 26. Round granite boulder that rolled from steep slope into the river.
  19. 27. Very large tor perched on cliff.
  20. 28. Tor, Possibly Rolled Onto Rock Pavement. Large pavement outcrop.
  21. 29. Two large round tors that may have rolled from steep slope into the main channel note base altered by water flow.
  22. 30. Rock smoothed by river flow, note water level change . Anvil rock - a pedestal rock undercut by flowing waters.
  23. 31. Anvil rock - a pedestal rock undercut by flowing waters.
  24. 32. Large pedestal undercut by water flow.
  25. 33. Excellent pedestal rock in main river channel Nitrolee riverbed.
  26. 34. Details of layered meta granite texture on a water polished surface.
  27. 35. Metagranite (light) and metadiorite?
  28. 36. Weathered sheared metagranite, off Brooklyn Road.
  29. 37. Granular texture in an altered metagranite .
  30. 38. Mafic dikes have been intruded into the granite, they contain minerals that are more water soluble, therefore, are weathered more relative to the metagranite.
  31. 39. A dike intruded into metagranite. Location is a roadcut above the river near Dearborn dam. Rocks here are weathered to saprolite i.e. minerals are chemically altered in place.
  32. 40. Vertical Mafic Dikes Injected Into the Metagranite.
  33. 41. Mafic dike offset by faulting.
  34. 42. Contact of mafic dike and granite.
  35. 43. Knife edge contact. Mafic dike Metagranite Brunton compass for scale.

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