San Diego Hydrogeology

Welcome to the U.S. Geological Survey (USGS) San Diego Hydrogeology project website. This site provides hydrologic data collected or compiled by the USGS in the San Diego area; some additional data may be available from the USGS database National Water Information System (NWIS).

Project Chief: Wes Danskin
Phone: 619-225-6132
Email: wdanskin@usgs.gov

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Lithologic Log for San Diego Balboa Park (17S/3W-1K1-5)

Shaker

[Altitude of land surface, 99.16 feet NAVD88. Depth is in feet below land surface. Drilled by U.S. Geological Survey using hydraulic mud rotary, March, 2008. Total depth drilled 1501 feet. Screened intervals: 1,470-1,490, 1,020-1.040, 560-580, 220-240, and 100-120ft.]

Depth (ft)	Description
10	Sandy gravel (sG); granules to medium pebbles with coarse to very coarse and fine sand; very poorly sorted; subangular; brown (10YR 4/3)
20	Gravelly sand (gS); coarse to very coarse sand and granules to medium pebbles; poorly to very poorly sorted; subangular; olive brown (2.5Y 4/3)
30	Gravelly sand (gS); coarse to very coarse sand and granules to medium pebbles; poorly sorted; subangular; olive (5Y 4/3)
40	Sandy gravel (sG); granules to medium pebbles and medium to very coarse sand; very poorly sorted; subangular; olive (5Y 4/4)
50	Sandy gravel (sG); granules to small pebbles and coarse to very coarse sand; poorly sorted; subrounded to rounded; olive (5Y 4/3)
60	Gravel (G); granules to medium pebbles with minor coarse to very coarse sand and silt; poorly sorted; subrounded to rounded; olive (5Y 4/3)
70	Gravel (G); granules to small pebbles with minor very coarse sand; moderately to poorly sorted; angular; olive gray (5Y 4/2)
80	Sandy gravel (sG); granules to medium pebbles and coarse to very coarse sand; very poorly sorted; subangular to angular; olive (5Y 5/3)
90	Gravelly sand (gS); coarse to very coarse sand and granules to medium pebbles; poorly sorted; subangular; olive (5Y 4/3); 1-5 mm shell fragments present
100	Gravelly sand (gS); coarse to very coarse sand and granules to medium pebbles; poorly sorted; subangular; pale olive (5Y 6/3)
110	Gravelly sand (gS); coarse to very coarse sand and granules to medium pebbles; poorly sorted; subangular to subrounded; olive (5Y 5/4); 1-12 mm shell fragments common
120	Slightly gravelly sand ((g)S); coarse to very coarse sand and granules to small pebbles; poorly to moderately sorted; subangular; olive (5Y 5/4); 1-4 mm shell fragments present
130	Gravelly sand (gS); coarse to very coarse sand and granules to small pebbles; poorly sorted; subangular; olive (5Y 4/3); whole shells and 1-6 mm fragments common
140	Gravelly silty sand (gmS); coarse to very coarse sand, silt and granules to medium pebbles; very poorly sorted; subangular; olive (5Y 4/3); 1-6 mm shell fragments common
150	Sandy gravel (sG); granules to medium pebbles and coarse to very coarse sand; very poorly sorted; subangular to subrounded; olive (5Y 4/3); 1-12 mm shell fragments common
160	Sandy gravel (sG); granules to medium pebbles and coarse to very coarse sand; very poorly sorted; subangular; dark olive gray (5Y 3/2); very abundant whole shells and 1-12 mm fragments
170	Slightly gravelly sandy clayey silt ((g)sM): silt, clay and granules to medium pebbles; very poorly sorted; dark olive gray (5Y 3/2); abundant 1-8 mm shell fragments
180	Silty gravel (mG); granules to small pebbles and silt; poorly sorted; subrounded; dark olive gray (5Y 3/2); abundant 2-14 mm fossil fragments
190	Slightly gravelly silty sand ((g)mS); coarse to very coarse sand, silt and granules; moderately sorted; subrounded to subangular; dark olive gray (5Y 3/2); very abundant 1-10 mm shell fragments and whole shells
200	Slightly gravelly silty sand ((g)mS); coarse to very coarse sand, silt and granules to medium pebbles; poorly sorted; subangular to angular; dark olive gray (5Y 3/2); abundant whole shells and 1-16 mm fragments
210	Gravelly silty sand (gmS); coarse to very coarse sand, silt and granules to small pebbles; poorly sorted; subangular; dark olive gray (5Y 3/2); abundant whole shells and 1-16 mm fragments
220	Sandy silt (sZ); silt and coarse to very coarse sand; moderately sorted; dark olive gray (5Y 3/2); abundant 1-12 mm shell fragments
230	Sand (S); coarse to very coarse sand; well sorted; subrounded; olive gray (5Y 4/2); abundant 1-11 mm shell fragments and whole shells
240	Sand (S); coarse to very coarse sand; well sorted; subrounded; olive gray (5Y 4/2); abundant 1-14 mm shell fragments
250	Gravelly sand (gS); coarse to very coarse sand and granules to small pebbles; poorly sorted; subangular; olive gray (5Y 4/2); abundant 1-20 mm shell fragments
260	Sandy gravel (sG); granules to medium pebbles and coarse to very coarse sand; poorly sorted; subangular; olive gray (5Y 4/2); abundant 1-24 mm shell fragments
270	Slightly gravelly sandy silt ((g)sM); silt, coarse to very coarse sand and granules to small pebbles; poorly sorted; olive gray (5Y 4/2); abundant 1-16 mm shell fragments
280	Clayey silt (M); silt and clay; very well sorted; very dark gray (5Y 3/1); abundant 1-10 mm shell fragments
290	Clayey silt (M); silt and clay; very well sorted; very dark gray (5Y 3/1); 1-12 mm shell fragments common
300	Clayey silt (M); silt and clay; very well sorted; very dark gray (5Y 3/1); 1-12 mm shell fragments common
310	Silt (Z); silt; very well sorted; dark olive gray (5Y 3/2); 1-8 mm shell fragments present
320	Silt (Z); silt; very well sorted; dark olive gray (5Y 3/2); 1-10 mm shell fragments common
330	Silt (Z); silt; very well sorted; dark olive gray (5Y 3/2); 1-12 mm shell fragments common
340	Silt (Z); silt; very well sorted; dark olive gray (5Y 3/2); 1-10 mm shell fragments common
350	Silt (Z); silt; very well sorted; dark olive gray (5Y 3/2); 1-14 mm shell fragments common
360	Silt (Z); silt; very well sorted; dark olive gray (5Y 3/2); 1-14 mm shell fragments common
370	Silt (Z); silt; very well sorted; dark olive gray (5Y 3/2); 1-4 mm shell fragments common
380	Clayey silt (M); silt and clay; very well sorted; dark olive gray (5Y 3/2); 1-16 mm shell fragments common
390	Clayey silt (M); silt and clay; very well sorted; dark olive gray (5Y 3/2); 1-8 mm shell fragments common
400	Clayey silt (M); silt and clay; very well sorted; dark olive gray (5Y 3/2); 1-5 mm shell fragments common
410	Clayey silt (M); silt and clay; very well sorted; dark olive gray (5Y 3/2); 1-12 mm shell fragments common
420	Silt (Z); silt; very well sorted; dark olive gray (5Y 3/2); 1-6 mm shell fragments common
430	Silt (Z); silt; very well sorted; dark olive gray (5Y 3/2); 1-12 mm shell fragments common
440	Silt (Z); silt; very well sorted; dark olive gray (5Y 3/2); 1-12 mm shell fragments common
450	Silt (Z); silt; very well sorted; dark olive gray (5Y 3/2); 1-4 mm shell fragments present
460	Silt (Z); silt; very well sorted; dark olive gray (5Y 3/2); 1-3 mm shell fragments common
470	Silt (Z); silt; very well sorted; dark olive gray (5Y 3/2); abundant 1-4 mm shell fragments
480	Silt (Z); silt; very well sorted; dark olive gray (5Y 3/2); abundant 1-22 mm shell fragments
490	Gravelly silt (gM); silt and granules to medium pebbles; very poorly sorted; dark olive gray (5Y 3/2); abundant 1-12 mm shell fragments
500	Slightly gravelly clayey silt ((g)M); silt, clay, granules to small pebbles and minor coarse to very coarse sand; very poorly sorted; dark gray (5Y 4/1); abundant 1-14 mm shell fragments
510	Clayey silt (M); silt and clay; very well sorted; dark olive gray (5Y 3/2); 1-10 mm shell fragments present
520	Silt (Z); silt; very well sorted; dark olive gray (5Y 3/2); 1-8 mm shell fragments present
530	Silt (Z); silt; very well sorted; dark olive gray (5Y 3/2); 1-7 mm shell fragments present
540	Slightly gravelly silt ((g)M); silt and granules to small pebbles; poorly sorted; dark olive gray (5Y 3/2); 1-4 mm shell fragments present
550	Silt (Z); silt with trace granules to very coarse sand; moderately sorted; dark olive gray (5Y 3/2); 1-5 mm shell fragments present
560	Clayey silt (M); silt and clay; very well sorted; dark olive gray (5Y 3/2); 1-4 mm shell fragments present
570	Slightly gravelly silty sand ((g)mS); coarse to very coarse sand, silt and granules to small pebbles; poorly sorted; subangular; dark olive gray (5Y 3/2); 1-3 mm shell fragments present
580	Gravelly silty sand (gmS); coarse to very coarse sand, silt and granules to small pebbles; poorly sorted; subangular to angular; dark olive gray (5Y 3/2); 1-5 mm shell fragments common
590	Gravelly silty sand (gmS); coarse to very coarse sand, silt and granules to medium pebbles; poorly to very poorly sorted; subangular; dark olive gray (5Y 3/2); 1-6 mm shell fragments common
600	Gravelly sandy silty clay (gM); clay, silt, coarse to very coarse sand and granules to small pebbles; very poorly sorted; gray (5Y 5/1); 1-5 mm shell fragments common
610	Silty sand (zS); coarse to very coarse sand and silt; moderately to poorly sorted; subangular; dark olive gray (5Y 3/2); abundant 1-11 mm shell fragments
620	Silty clayey sand (mS); medium to very coarse sand, clay and silt; very poorly sorted; subangular; gray (5Y 6/1); 1-5 mm shell fragments common
630	Sandy clay (sC); clay and coarse to very coarse sand; poorly sorted; grayish brown (2.5Y 5/2); minor 1-2 mm shell fragments present
640	Slightly gravelly clayey sand ((g)mS); medium to coarse sand, clay and granules; very poorly sorted; angular; light brownish gray (2.5Y 6/2); minor 1-3 mm shell fragments present
650	Sandy silty clay (sM); clay, silt, very fine sand and coarse to very coarse sand; very poorly sorted; light brownish gray (2.5Y 6/2); trace 1 mm shell fragments
660	Sandy silty clay (sM); clay, silt and very fine to very coarse sand; very poorly sorted; light brownish gray (2.5Y 6/2); trace 1-2 mm shell fragments
670	Sandy silty clay (sM); clay, silt and very fine to very coarse sand; very poorly sorted; light brownish gray (2.5Y 6/2); trace 1-2 mm shell fragments
680	Slightly gravelly sandy silty clay ((g)sM); clay, silt, very fine to very coarse sand and granules; very poorly sorted; light brownish gray (2.5Y 6/2); minor 1-4 mm shell fragments
690	Slightly gravelly sandy silty clay ((g)sM); clay, silt, very fine to very coarse sand and granules; very poorly sorted; light brownish gray (2.5Y 6/2); trace 1-2 mm shell fragments
700	Sandy silty clay (sM); clay, silt and medium to very coarse sand; poorly sorted; grayish brown (10YR 5/2)
710	Gravelly silty clayey sand (gmS); medium to very coarse sand, clay, silt and granules to medium pebbles; very poorly sorted; subrounded; grayish brown (10YR 5/2)
720	Sandy clay (sC); clay and medium to coarse sand; moderately to well sorted; light yellowish brown (2.5Y 6/3); abundant 1-3 mm shell fragments
730	Slightly gravelly sandy silty clay ((g)sM); clay, silt, coarse to very coarse sand and granules; very poorly sorted; pale brown (10YR 6/3); 1-3 mm shell fragments common
740	Slightly gravelly sandy silty clay ((g)sM); clay, silt, coarse to very coarse sand and granules; very poorly sorted; pale brown (10YR 6/3); 1-2 mm shell fragments common
750	Sandy clayey silt (sM); silt, clay, fine sand and coarse to very coarse sand; very poorly sorted; pale brown (10YR 6/3); 1-3 mm shell fragments common
760	Sandy silty clay (sM); clay, silt, fine sand and coarse sand; poorly sorted; pale brown (10YR 6/3); minor 1 mm shell fragments present
770	Slightly gravelly sandy clayey silt ((g)sM): silt, clay, coarse to very coarse sand and granules; very poorly sorted; pale brown (10YR 6/3); 1-4 mm shell fragments common
780	Gravelly silty sand (gmS); fine to coarse sand, silt and granules to small pebbles; very poorly sorted; angular; grayish brown (2.5Y 5/2)
790	Slightly gravelly silty sand ((g)mS); coarse to very coarse and fine to very fine sand, silt and granules to small pebbles; very poorly sorted; angular; light brownish gray (2.5Y 6/2); minor 1-2 mm shell fragments
800	Slightly gravelly silty sand ((g)mS); coarse to very coarse sand, silt and granules; poorly sorted; angular to very angular; light brownish gray (2.5Y 6/2); minor 1-2 mm shell fragments
810	Silty sand (zS); coarse to very coarse sand and silt; moderately sorted; angular; light brownish gray (2.5Y 6/2)
820	Silty sand (zS); coarse to very coarse sand and silt; moderately sorted; angular; light brownish gray (2.5Y 6/2)
830	Silty sand (zS); coarse to very coarse sand and silt; moderately sorted; angular; light brownish gray (2.5Y 6/2)
840	Silty sand (zS); medium to very coarse sand and silt; moderately to poorly sorted; angular; light olive brown (2.5Y 5/4)
850	Clayey silty sand (mS); medium to very fine sand, silt and clay; moderately to poorly sorted; angular; grayish brown (2.5Y 5/2)
860	Sandy silty clay (sM); clay, silt and very fine sand; well sorted; grayish brown (2.5Y 5/2)
870	Sandy silty clay (sM); clay, silt and very fine sand; very well sorted; grayish brown (2.5Y 5/2)
880	Sandy silty clay (sM); clay, silt and very fine sand; well sorted; grayish brown (2.5Y 5/2)
890	Sandy silty clay (sM); clay, silt, very fine sand and coarse to very coarse sand; very poorly sorted; olive brown (2.5Y 4/3)
900	Clayey silty sand (mS); fine to very fine sand, coarse to very coarse sand, silt and clay; very poorly sorted; subangular to angular; dark grayish brown (2.5Y 4/2)
910	Sand (S); fine to very fine sand and minor coarse to very coarse sand; poorly sorted; subangular; dark grayish brown (2.5Y 4/2)
920	Sand (S); fine to very fine sand; very well sorted; subrounded to subangular; dark grayish brown (2.5Y 4/2)
930	Clayey sand (cS); medium to very fine sand and clay; moderately sorted; subrounded; dark grayish brown (2.5Y 4/2)
940	Slightly gravelly clayey sand ((g)mS); medium to very fine sand, minor coarse to very coarse sand, clay and granules; very poorly sorted; subangular to angular; dark grayish brown (2.5Y 4/2)
950	Sandy gravel (sG); granules to small pebbles and coarse to very coarse sand; moderately sorted; angular; dark grayish brown (2.5Y 4/2)
960	Sandy gravel (sG); granules to small pebbles and coarse to very coarse sand; moderately sorted; angular; olive brown (2.5Y 4/3)
970	Gravel (G); granules to large pebbles; moderately to poorly sorted; subangular; light olive brown (2.5Y 5/3)
980	Sandy gravel (sG); granules to medium pebbles and coarse to very coarse sand; moderately to poorly sorted; subangular; grayish brown (2.5Y 5/2)
990	Sandy gravel (sG); granules to medium pebbles and coarse to very coarse sand; moderately to poorly sorted; subangular; grayish brown (2.5Y 5/2)
1000	Gravelly sand (gS); coarse to very coarse sand and granules to small pebbles; moderately sorted; subangular; grayish brown (2.5Y 5/2)
1010	Gravelly sand (gS); coarse to very coarse sand and granules to small pebbles; moderately sorted; subangular; dark grayish brown (2.5Y 4/2)
1020	Gravelly sand (gS); coarse to very coarse sand and granules; moderately sorted; subangular; dark grayish brown (2.5Y 4/2)
1030	Gravelly sand (gS); coarse to very coarse sand and granules to small pebbles; moderately to poorly sorted; subangular; dark grayish brown (2.5Y 4/2)
1040	Gravelly sand (gS); coarse to very coarse sand and granules to medium pebbles; poorly sorted; subangular to angular; olive brown (2.5Y 4/3)
1050	Gravelly sand (gS); coarse to very coarse sand and granules to medium pebbles; poorly sorted; subrounded to subangular; dark yellowish brown (10YR 4/4)
1060	Gravelly sand (gS); coarse to very coarse sand and granules to small pebbles; moderately to poorly sorted; subangular to angular; dark grayish brown (2.5Y 4/2)
1070	Gravelly sand (gS); coarse to very coarse sand and granules to small pebbles; moderately to poorly sorted; subangular; dark grayish brown (2.5Y 4/2)
1080	Gravelly sand (gS); coarse to very coarse sand and granules to small pebbles; moderately to poorly sorted; subangular; dark grayish brown (2.5Y 4/2)
1090	Gravelly sand (gS); coarse to very coarse sand and granules to medium pebbles; moderately to poorly sorted; subangular; dark grayish brown (2.5Y 4/2)
1100	Gravelly sand (gS); coarse to very coarse sand and granules to medium pebbles; moderately to poorly sorted; dark grayish brown (2.5Y 4/2)
1110	Gravelly sand (gS); coarse to very coarse sand and granules to medium pebbles; poorly sorted; angular to subangular; dark grayish brown (2.5Y 4/2)
1120	Gravelly sand (gS); coarse to very coarse sand and granules to medium pebbles; poorly sorted; subangular; dark grayish brown (2.5Y 4/2)
1130	Gravelly sand (gS); coarse to very coarse sand and granules to small pebbles; moderately to poorly sorted; angular; dark grayish brown (2.5Y 4/2)
1140	Sandy gravel (sG); granules to small pebbles and coarse to very coarse sand; poorly sorted; angular; dark grayish brown (2.5Y 4/2)
1150	Sandy gravel (sG); granules to medium pebbles and coarse to very coarse sand; poorly sorted; subangular to subrounded; olive brown (2.5Y 4/3)
1160	Sandy gravel (sG); granules to medium pebbles and coarse to very coarse sand; poorly sorted; subangular to subrounded; olive brown (2.5Y 4/3)
1170	Sandy gravel (sG); granules to medium pebbles and coarse to very coarse sand; poorly sorted; subangular; olive brown (2.5Y 4/3)
1180	Sandy gravel (sG); granules to small pebbles and coarse to very coarse sand; poorly sorted; subangular; olive brown (2.5Y 4/3)
1190	Gravel (G); granules to medium pebbles; moderately sorted; subangular; grayish brown (2.5Y 5/2)
1200	Gravel (G); granules to medium pebbles; moderately sorted; subangular; grayish brown (2.5Y 5/2)
1210	Sandy gravel (sG); granules to medium pebbles and coarse to very coarse sand; poorly sorted; subrounded to subangular; grayish brown (2.5Y 5/2)
1220	Sandy gravel (sG); granules to medium pebbles and coarse to very coarse sand; poorly sorted; subangular; grayish brown (2.5Y 5/2)
1230	Gravel (G); granules to medium pebbles; moderately to well sorted; subangular; grayish brown (2.5Y 5/2)
1240	Sandy gravel (sG); granules to medium pebbles and coarse to very coarse sand; poorly sorted; angular; olive brown (2.5Y 4/3)
1250	Gravel (G); granules to medium pebbles; moderately to poorly sorted; subangular; olive brown (2.5Y 4/3)
1260
1270	Slightly gravelly clayey silty sand ((g)mS); coarse to very coarse sand, fine to very fine sand, silt, clay and granules; very poorly sorted; subrounded; dark grayish brown (2.5Y 4/2)
1280	Slightly gravelly clayey silty sand ((g)mS); coarse to very coarse sand, fine to very fine sand, silt, clay and granules; very poorly sorted; subangular; dark grayish brown (2.5Y 4/2)
1290	Slightly gravelly clayey silty sand ((g)mS); fine to very fine sand, coarse to very coarse sand, silt, clay and granules; very poorly sorted; subangular; dark grayish brown (2.5Y 4/2)
1300	Slightly gravelly clayey silty sand ((g)mS); fine to very fine sand, coarse to very coarse sand, silt, clay and granules; very poorly sorted; subangular; dark grayish brown (2.5Y 4/2)
1310	Slightly gravelly clayey silty sand ((g)mS); fine to very fine sand, minor very coarse sand, silt, clay and granules to small pebbles; very poorly sorted; subangular; dark grayish brown (2.5Y 4/2)
1320	Sandy silty clay (sM); clay, silt and fine to very fine sand; moderately sorted; dark gray (2.5Y 4/1)
1330	Sandy silty clay (sM); clay, silt and fine to very fine sand; moderately sorted; dark gray (2.5Y 4/1)
1340	Silty clay (M); clay and silt; very well sorted; dark gray (2.5Y 4/1)
1350	Silty clay (M); clay and silt; very well sorted; dark gray (2.5Y 4/1)
1360	Clay (C); clay; very well sorted; dark gray (2.5Y 4/1)
1370	Slightly gravelly sandy silty clay ((g)sM); clay, silt, fine to very fine sand and granules; poorly sorted; dark gray (2.5Y 4/1)
1380	Sandy silty clay (sM); clay, silt and medium to very fine sand; poorly to moderately sorted; dark gray (2.5Y 4/1)
1390	Sandy silty clay (sM); clay, silt and medium to very fine sand; moderately sorted; dark gray (2.5Y 4/1)
1400	Sandy silty clay (sM); clay, silt and medium to very fine sand; moderately sorted; dark gray (2.5Y 4/1)
1410	Sandy silty clay (sM); clay, silt and fine to very fine sand; well sorted; dark gray (2.5Y 4/1)
1420	Sandy silty clay (sM); clay, silt and medium to very fine sand; moderately sorted; dark gray (2.5Y 4/1)
1430	Sandy silty clay (sM); clay, silt, medium to very fine sand and trace coarse sand; poorly sorted; dark gray (2.5Y 4/1)
1440	Silty clayey sand (mS); coarse to very fine sand, clay and silt; poorly sorted; angular to subangular; dark gray (2.5Y 4/1)
1450	Clayey silty sand (mS); medium to very fine sand, silt and clay; moderately sorted; subangular; dark gray (2.5Y 4/1)
1460	Slightly gravelly clayey sand ((g)mS); medium to very coarse sand, clay and granules; moderately to poorly sorted; subangular; gray (2.5Y 5/1)
1470	Slightly gravelly clayey sand ((g)mS); medium to very coarse sand, clay and granules; moderately to poorly sorted; subangular; gray (2.5Y 5/1)
1480	Slightly gravelly clayey sand ((g)mS); medium to very coarse sand, clay and granules to small pebbles; poorly sorted; subangular; gray (2.5Y 5/1)
1490	Slightly gravelly clayey sand ((g)mS); medium to very coarse sand, clay and granules to small pebbles; poorly sorted; subangular; gray (2.5Y 5/1)
1498	Slightly gravelly clayey sand ((g)mS); medium to very coarse sand, clay and granules to small pebbles; poorly sorted; subangular; gray (2.5Y 5/1)
1501 SHOE	Sand (S); medium to fine sand; very well sorted; subangular; very dark gray (2.5Y 3/1)

Questions about San Diego Hydrogeology? Please contact Wes Danskin (email: wdanskin@usgs.gov or send a letter). 619.225.6132