Lithologic Log for San Diego Balboa Park (17S/3W-1K1-5)
Sieve
[Altitude of land surface, 99.16 feet NAVD88. Depth is in feet below land surface. Soil and rock color notation from Munsell Color (1994). Drilled by U.S. Geological Survey using hydraulic rotary to 1,600 feet, March 2008. Total depth drilled 1,501 ft. Well casing to 1,490 ft. Screened interval: 1,470-1,490, 1,020-1.040, 560-580, 220-240, and 100-120ft.]
| Depth(ft) from |
Depth(ft) to |
Description |
|---|---|---|
| 0 | 20 | Slightly gravelly sand ((g)S); fine to medium with some coarse sand, gravel <20 mm; moderately sorted; subangular to subrounded |
| 20 | 40 | Sand (S); fine to medium with minor very fine sand; well sorted; subangular to subrounded |
| 40 | 60 | Sand (S); very fine to fine with occasional medium to coarse sand and gravel; well sorted; subangular to subrounded with rounded gravel |
| 60 | 80 | Sand (S); very fine to fine with occasional medium to coarse and gravel; well sorted; subangular to subrounded with subrounded to rounded gravel |
| 80 | 100 | Sand (S); very fine to fine with some minor medium sand; well sorted; subangular to subrounded |
| 100 | 120 | Sand (S); very fine to fine with some minor medium sand; well sorted; subangular to subrounded |
| 120 | 140 | Sand (S); fine to medium with some very fine to coarse sand; moderately sorted; subangular to subrounded; fossil fragments of bivalves and gastropods; marine deposit |
| 140 | 160 | Slightly gravelly sand ((g)S); very fine sand with minor fine to coarse sand grain, silt and gravel <8mm; poorly sorted; subangular to subrounded sand, subrounded to rounded gravel; fragments of fossil bivalve shells; marine deposit |
| 160 | 180 | Silty sand (zS); very fine to fine sand with minor silt; well sorted; subangular to subrounded; fragments of fossil bivalve shells; marine deposit |
| 180 | 200 | Sand (S); very fine to fine; well sorted; subangular to subrounded; fragments of fossil bivalve shells; marine deposit |
| 200 | 220 | Sand (S); very fine to fine with occasional medium to coarse sand; moderately sorted; subangular to subrounded; fragments of fossil bivalve shells; marine deposit |
| 220 | 240 | Sand (S); very fine to fine with minor medium to coarse sand; moderately sorted; subangular to subrounded |
| 240 | 260 | Sand (S); very fine; well sorted; subangular to subrounded; occasional fragments of fossil bivalve shells; marine deposit |
| 260 | 280 | Silty sand (zS); very fine sand with some silt; well sorted; subangular to subrounded; fragments of fossil bivalve shells; marine deposit |
| 280 | 300 | Silty sand (zS); very fine sand with some silt; well sorted; subangular to subrounded; occasional fragment of fossil bivalve shells; marine deposit |
| 300 | 320 | Silty sand (zS); very fine sand with some silt; well sorted; subangular to subrounded; marine deposit |
| 320 | 340 | Silty sand (zS); very fine sand with some silt; well sorted; subangular to subrounded; marine deposit |
| 340 | 360 | Silty sand (zS); very fine sand with some silt; well sorted; subangular to subrounded; marine deposit |
| 360 | 380 | Silty sand (zS); very fine sand with some silt; well sorted; subangular to subrounded; marine deposit |
| 380 | 400 | Sandy silt (sZ); silt with some very fine sand; well sorted; fragments of fossil bivalve shells; marine deposit |
| 400 | 420 | Silty clay (M); clay with silt; well sorted; fragments of fossil bivalve shells; marine deposit |
| 420 | 440 | Sandy silt (sZ); silt with some very fine sand; well sorted; marine deposit |
| 440 | 460 | Sandy silt (sZ); silt with some very fine sand; well sorted; subangular to subrounded sand; marine deposit |
| 460 | 480 | Silty sand (zS); sand with some silt; well sorted; subangular to subrounded; fragments of fossil bivalve shells; marine deposit |
| 480 | 500 | Silty sand (zS); sand with some silt; well sorted; subangular to subrounded; fragments of fossil bivalve shells and gastropods; marine deposit |
| 500 | 520 | Silty clay (M); clay with some silt, minor sand; well sorted; fragments of bivalve shells; marine deposit |
| 520 | 540 | Sandy silty clay (sM); clay with silt and some sand; moderately sorted; subangular to subrounded sand; fossil fragments of bivalve shells; marine deposit |
| 540 | 560 | Sandy silt (sZ); silt with some sand; well sorted; subangular to subrounded; fossil fragments of bivalve shells; marine deposit |
| 560 | 580 | Sand (S); fine to coarse; moderately sorted; subangular to subrounded; fossil fragments of bivalve shells; marine deposit |
| 580 | 600 | Sand (S); fine to medium with minor coarse to very coarse sand; poorly sorted; subangular to subrounded; fossil fragments of bivalve shells; marine deposit |
| 600 | 620 | Sand (S); fine to medium with some coarse sand; moderately sorted; subangular to subrounded; fossil shell fragments; marine deposit |
| 620 | 640 | Clayey sand (cS); fine to medium with some coarse to very coarse sand and minor clay; poorly sorted; subangular to subrounded; fossil shell fragments; marine deposit |
| 640 | 660 | Silty sand (zS); fine to medium with some coarse sand and minor silt; moderately sorted; subangular to subrounded; marine deposit |
| 660 | 680 | Silty sand (zS); very fine to medium sand with some silt; moderately sorted; subangular to subrounded; marine deposit |
| 680 | 700 | Clayey sand (cS); very fine to fine sand with minor medium sand and minor clay; poorly sorted; subangular to subrounded; possible marine deposit |
| 700 | 720 | Clayey sand (cS); very fine to medium sand with minor clay; moderately sorted; subangular to subrounded; possible marine deposit |
| 720 | 740 | Clayey sand (cS); very fine to fine with some minor medium to coarse sand and minor clay; poorly sorted; subangular to subrounded; possible marine deposit |
| 740 | 760 | Clayey sand (cS); very fine to fine with minor medium to coarse sand and minor clay; poorly sorted; subangular to subrounded |
| 760 | 780 | Sand (S); fine to medium with occasional coarse sand; well sorted; subangular to subrounded |
| 780 | 800 | Sand (S); fine to medium with occasional coarse sand grain; well sorted; subangular to subrounded |
| 800 | 820 | Sand (S); fine to medium with minor very fine sand; moderately sorted; subangular to subrounded |
| 820 | 840 | Sand (S); fine to medium with minor very fine sand; moderately sorted; subangular to subrounded |
| 840 | 860 | Clayey sand (cS); very fine to fine sand with some clay; moderately sorted; subangular to subrounded |
| 860 | 880 | Silty clay (M); clay with some silt and minor very fine sand present; moderately sorted |
| 880 | 900 | Clayey sand (cS); fine to medium sand with some very fine sand and clay; moderately sorted; subangular to subrounded |
| 900 | 920 | Silty clay (M); clay with some silt; well sorted |
| 920 | 940 | Sandy silty clay (sM); clay with some silt and minor very fine to fine sand; poorly sorted |
| 940 | 960 | Sand (S); fine with very fine to medium sand and occasional coarse sand grain; moderately sorted; subangular to subrounded |
| 960 | 980 | Slightly gravelly sand ((g)S); fine to medium with occasional coarse sand grain and gravel <8 mm in diameter; poorly sorted; subangular to subrounded with angular to subrounded gravel |
| 980 | 1000 | Sand (S); fine to medium with some very fine to coarse sand; moderately sorted; subangular to subrounded |
| 1000 | 1020 | Sand (S); fine to medium with minor coarse sand; moderately sorted; subangular to subrounded |
| 1020 | 1040 | Sand (S); fine to coarse; moderately sorted; subangular to subrounded |
| 1040 | 1060 | Sand (S); fine to medium with some coarse sand; moderately sorted; subangular to subrounded |
| 1060 | 1080 | Sand (S); fine to medium with some coarse to very coarse sand; moderately sorted; subangular to subrounded |
| 1080 | 1100 | Slightly gravelly sand ((g)S); fine to medium with some very fine to very coarse sand and gravel <5mm in diameter; poorly sorted; angular to subrounded sand and gravel |
| 1100 | 1120 | Slightly gravelly sand ((g)S); fine to medium with some very fine to very coarse sand and gravel <6mm in diameter; poorly sorted; subangular to subrounded with angular to subrounded gravel |
| 1120 | 1140 | Sand (S); fine to medium with some very fine to coarse sand; moderately sorted; subangular to subrounded |
| 1140 | 1160 | Slightly gravelly sand ((g)S); fine to medium with some coarse sand, gravel <10mm in diameter; poorly sorted; subangular to subrounded |
| 1160 | 1180 | Gravelly sand (gS); fine to coarse with some very coarse sand and gravel <10mm in diameter and minor clay; poorly sorted; subangular to subrounded sand with angular to subrounded gravel |
| 1180 | 1200 | Slightly gravelly sand ((g)S); fine to medium with some coarse sand and gravel <10mm in diameter and minor clay; poorly sorted; subangular to subrounded |
| 1200 | 1220 | Sand (S); fine to medium; well sorted; subangular to subrounded |
| 1220 | 1240 | Sand (S); fine to medium; well sorted; subangular to subrounded |
| 1240 | 1260 | Sand (S); very fine to fine with minor medium sand; well sorted; subangular to subrounded |
| 1260 | 1280 | Sand (S); fine with some very fine to medium sand; well sorted; subangular to subrounded |
| 1280 | 1300 | Silty sand (zS); very fine to fine sand with some silt; moderately sorted; subangular to subrounded |
| 1300 | 1320 | Silty sand (zS); very fine to fine sand with minor medium to coarse sand and silt; poorly sorted; subangular to subrounded |
| 1320 | 1340 | Sand (S); very fine to fine; well sorted; subangular to subrounded |
| 1340 | 1360 | Silty sand (zS); very fine with minor fine to coarse sand grains, silt and minor clay; poorly sorted; subangular to subrounded; occasional fossil fragments of shells; marine deposit |
| 1360 | 1380 | Clayey silty sand (mS); very fine to fine sand with some silt and clay; poorly sorted; subangular to subrounded; occasional fossil shell fragments; marine deposit |
| 1380 | 1400 | Sand (S); very fine to fine sand with some minor silt; well sorted; subangular to subrounded; marine deposit |
| 1400 | 1420 | Sand (S); very fine to fine with some minor silt; well sorted; subangular to subrounded; marine deposit |
| 1420 | 1440 | Sand (S); very fine to fine with some minor silt; well sorted; subangular to subrounded; marine deposit |
| 1440 | 1460 | Sand (S); very fine to fine with some medium sand and minor silt; moderately sorted; subangular to subrounded; marine deposit |
| 1460 | 1480 | Sand (S); fine with some very fine to medium sand; moderately sorted; subangular to subrounded; marine deposit |
| 1480 | 1501 | Sand (S); very fine to fine with some medium sand and minor silt; moderately sorted; subangular to subrounded; marine deposit |
Questions about San Diego Hydrogeology? Please contact Wes Danskin (email: wdanskin@usgs.gov or send a letter). 619.225.6132
