329 Ind. Admin. Code 10-2-206.3
Current through January 8, 2025
Authority: IC 13-14-8-7; IC 13-15; IC 13-19-3
Affected: IC 13-11-2-17; IC 13-18; IC 25-31; IC 36-9-30
Sec. 206.3.
"Wentworth grain-size scale" means grain-size divisions defined by the following:
| Grain Size Scales* | ||
| Grade Limits in Millimeters | Grade Name | |
| Lower Limit | Upper Limit | |
| 256 and above | Boulders | |
| 64 | 256 | Cobbles |
| 16 | 64 Coarse | Pebbles |
| 4 | 16 Fine | |
| 2 | 4 | Granules |
| 1 | 2 Very Coarse | Sand |
| 0.5 | 1 Coarse | |
| 0.25 | 0.5 Medium | |
| 0.125 | 0.25 Fine | |
| 0.062 | 0.125 Very Fine | |
| 0.031 | 0.062 Very Coarse | Silt |
| 0.016 | 0.031 Coarse | |
| 0.008 | 0.016 Medium | |
| 0.004 | 0.008 Fine | |
| 0.002 | 0.004 Very Fine | |
| Below 0.002 | 0.002 | Clay |
*IDEM, Requirements for Describing Unconsolidated Deposits, revised November 19, 1988.
329 IAC 10-2-206.3