The groove is not deep, but goes all the way around. Some pics are good, some not so good. Got to get different camera.
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Grinding Stones-Bases-Flat Sandstone-Hollowed Out Rocks=Question 004.jpg64 KB · Views: 296
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Grinding Stones-Bases-Flat Sandstone-Hollowed Out Rocks=Question 006.jpg59.1 KB · Views: 306
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Grinding Stones-Bases-Flat Sandstone-Hollowed Out Rocks=Question 008.jpg72.5 KB · Views: 316
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Grinding Stones-Bases-Flat Sandstone-Hollowed Out Rocks=Question 010.jpg83 KB · Views: 297
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