Soil Data Explorer - SPEARHEAD

Official Series Description

Lab Data Summary

Aggregate lab data for the SPEARHEAD soil series. This aggregation is based on all pedons with a current taxon name of SPEARHEAD, and applied along 1-cm thick depth slices. Solid lines are the slice-wise median, bounded on either side by the interval defined by the slice-wise 5th and 95th percentiles. The median is the value that splits the data in half. Five percent of the data are less than the 5th percentile, and five percent of the data are greater than the 95th percentile. Values along the right hand side y-axis describe the proportion of pedon data that contribute to aggregate values at this depth. For example, a value of "90%" at 25cm means that 90% of the pedons correlated to SPEARHEAD were used in the calculation. Source: KSSL snapshot (updated 2020-03-18). Methods used to assemble the KSSL snapshot used by SoilWeb / SDE

There are insufficient data to create the lab data summary figure.

Water Balance

Monthly water balance estimated using a leaky-bucket style model for the SPEARHEAD soil series. Monthly precipitation (PPT) and potential evapotranspiration (PET) have been estimated from the 50th percentile of gridded values (PRISM 1981-2010) overlapping with the extent of SSURGO map units containing each series as a major component. Monthly PET values were estimated using the method of Thornthwaite (1948). These (and other) climatic parameters are calculated with each SSURGO refresh and provided by the fetchOSD function of the soilDB package. Representative water storage values (“AWC” in the figures) were derived from SSURGO by taking the 50th percentile of profile-total water storage (sum[awc_r * horizon thickness]) for each soil series. Note that this representation of “water storage” is based on the average ability of most plants to extract soil water between 15 bar (“permanent wilting point”) and 1/3 bar (“field capacity”) matric potential. Soil moisture state can be roughly interpreted as “dry” when storage is depleted, “moist” when storage is between 0mm and AWC, and “wet” when there is a surplus. Clearly there are a lot of assumptions baked into this kind of monthly water balance. This is still a work in progress.

Sibling Summary

Siblings are those soil series that occur together in map units, in this case with the SPEARHEAD series. Sketches are arranged according to their subgroup-level taxonomic structure. Source: SSURGO snapshot (updated 2024-02-21), parsed OSD records (updated 2023-10-06) and snapshot of SC database (updated 2023-10-02).

Select annual climate data summaries for the SPEARHEAD series and siblings. Series are sorted according to hierarchical clustering of median values. Source: SSURGO map unit geometry and 1981-2010, 800m PRISM data (updated 2023-10-09).

Geomorphic description summaries for the SPEARHEAD series and siblings. Series are sorted according to hierarchical clustering of proportions and relative hydrologic position within an idealized landform (e.g. top to bottom). Most soil series (SSURGO components) are associated with a hillslope position and one or more landform-specific positions: hills, mountain slopes, terraces, and/or flats. Proportions can be interpreted as an aggregate representation of geomorphic membership. The values printed to the left (number of component records) and right (Shannon entropy) of stacked bars can be used to judge the reliability of trends. Small Shannon entropy values suggest relatively consistent geomorphic association, while larger values suggest lack thereof. Source: SSURGO component records (updated 2023-10-04).

There are insufficient data to create the 3D flats position figure.

Competing Series

Soil series competing with SPEARHEAD share the same family level classification in Soil Taxonomy. Source: parsed OSD records (updated 2023-10-06) and snapshot of the SC database (updated 2023-10-02).

Select annual climate data summaries for the SPEARHEAD series and competing. Series are sorted according to hierarchical clustering of median values. Source: SSURGO map unit geometry and 1981-2010, 800m PRISM data (updated 2023-10-09).

Geomorphic description summaries for the SPEARHEAD series and competing. Series are sorted according to hierarchical clustering of proportions and relative hydrologic position within an idealized landform (e.g. top to bottom). Proportions can be interpreted as an aggregate representation of geomorphic membership. Most soil series (SSURGO components) are associated with a hillslope position and one or more landform-specific positions: hills, mountain slopes, terraces, and/or flats. The values printed to the left (number of component records) and right (Shannon entropy) of stacked bars can be used to judge the reliability of trends. Shannon entropy values close to 0 represent soil series with relatively consistent geomorphic association, while values close to 1 suggest lack thereof. Source: SSURGO component records (updated 2023-10-04).

There are insufficient data to create the 3D hills figure.

There are insufficient data to create the 3D terrace figure.

There are insufficient data to create the 3D flats position figure.

Soil series sharing subgroup-level classification with SPEARHEAD, arranged according to family differentiae. Hovering over a series name will print full classification and a small sketch from the OSD. Source: snapshot of SC database (updated 2023-10-02).

Block Diagrams

No block diagrams are available.

Map Units

Map units containing SPEARHEAD as a major component. Limited to 250 records.

Map Unit Name	Symbol	Map Unit Area (ac)	Map Unit Key	National Map Unit Symbol	Soil Survey Area	Publication Date	Map Scale
Gany family, extremely stony surface-Rubble land-Spearhead family, very stony surface, complex, 40 to 75 percent slopes	127CK	94	3239074	30mr0	id703		1:24000
Spearhead family, very stony surface-Broad Canyon, very stony surface-Ezbin complex, 30 to 60 percent slopes, MLRA 13	389	13	3163623	2rfzr	id709	1976	1:24000
Spearhead family, very stony surface-Broad Canyon, very stony surface-Ezbin complex, 30 to 60 percent slopes, MLRA 13	389	396	3173246	2rfzr	id711	1983	1:24000
Spearhead family, very stony surface-Broad Canyon, very stony surface-Ezbin complex, 30 to 60 percent slopes, MLRA 47	38947	128	3173317	2x024	id712	2008	1:24000
Toze, stony surface-Kingmine, stony surface-Spearhead families, complex 25 to 65 percent slopes	967	31	3173286	2wxbn	id712	2008	1:24000
Spearhead family, very stony surface-Broad Canyon, very stony surface-Ezbin complex, 30 to 60 percent slopes, MLRA 43B	38943	3	3173316	2x023	id712	2008	1:24000
Spearhead family-Broad Canyon, very stony surface, complex, 40 to 70 percent slopes, MLRA 47	1026	12739	2917033	2w9rr	id713		1:24000
Spearhead family-Spearhead family, warm-Booneville complex, 30 to 60 percent slopes	1027	11554	2917034	2w9rs	id713		1:24000
Spearhead family, very stony surface-Broad Canyon, very stony surface-Ezbin complex, 30 to 60 percent slopes, MLRA 13	389	7623	2619837	2rfzr	id713		1:24000
Parkcity-Spearhead-Ezbin families, complex, 10 to 40 percent slopes	875	7585	2733489	2slst	id713		1:24000
Ezbin-Davtone family-Spearhead family, complex, 20 to 50 percent slopes	387	6641	2432601	2mnb0	id713		1:24000
Spearhead family, very stony surface-Broad Canyon, very stony surface-Ezbin complex, 30 to 60 percent slopes, MLRA 47	38947	3494	2980911	2x024	id713		1:24000
Toze, stony surface-Kingmine, stony surface-Spearhead families, complex 25 to 65 percent slopes	967	1942	2968239	2wxbn	id713		1:24000
Spearhead family, very stony surface-Broad Canyon, very stony surface-Ezbin complex, 30 to 60 percent slopes, MLRA 43B	38943	1745	2980910	2x023	id713		1:24000
Sponsor family-Ezbin-Spearhead family, complex, 25 to 50 percent slopes	995	1551	2963880	2wv37	id713		1:24000
Spearhead family-Broad Canyon, very stony surface, complex, 40 to 70 percent slopes, MLRA 13	102613	995	2980896	2x01s	id713		1:24000
Sponsor family-Ezbin-Spearhead family, complex, 5 to 25 percent slopes	977	924	2963881	2wv38	id713		1:24000
Cowdrey-Spearhead family, complex, 5 to 15 percent slopes	862	776	2984243	2x03p	id713		1:24000
Spearhead family, very stony surface-Broad Canyon, very stony surface-Ezbin complex, 30 to 60 percent slopes, MLRA 13	389	46	3173342	2rfzr	id714	1997	1:24000
Spearhead family, very stony surface-Broad Canyon, very stony surface-Ezbin complex, 30 to 60 percent slopes, MLRA 13	389	9	3173370	2rfzr	id715	1994	1:24000
Spearhead family, very stony surface-Broad Canyon, very stony surface-Ezbin complex, 30 to 60 percent slopes, MLRA 43B	38943	627	3163484	2x023	id716		1:24000
Parkcity-Spearhead-Ezbin families, complex, 10 to 40 percent slopes	875	475	3163448	2slst	id716		1:24000
Spearhead family-Spearhead family, warm-Booneville complex, 30 to 60 percent slopes	1027	74	2984400	2w9rs	id716		1:24000
Sponsor family-Ezbin-Spearhead family, complex, 25 to 50 percent slopes	995	22	3163479	2wv37	id716		1:24000
Worock-Spearhead-Enentah families, complex, 15 to 70 percent slopes, extremely stony surface	127CL		3320441	30mqz	id720		1:24000
Gany family, extremely stony surface-Rubble land-Spearhead family, very stony surface, complex, 40 to 75 percent slopes	127CK		3320440	30mr0	id720		1:24000
Worock-Spearhead-Enentah families, complex, 15 to 70 percent slopes, extremely stony surface	127CL	1532	3312445	30mqz	id752	1999	1:24000
Spearhead-Midfork association	28	284	1949749	23fw4	id758	1998	1:24000
Daisypeak-Spearhead-Dryadine, stony families, complex, 25 to 60 percent slopes	1256F	2	3039718	2rf1q	mt613	1975	1:24000
Daisypeak-Spearhead-Dryadine, stony families, complex, 25 to 60 percent slopes	1256F	8	3094094	2rf1q	mt630	1991	1:24000
Daisypeak-Spearhead-Dryadine, stony families, complex, 25 to 60 percent slopes	1256F	10664	2627430	2rf1q	mt632		1:24000
Dryadine, extremely stony-Helmville, very stony-Spearhead, very stony families, complex, 40 to 70 percent slopes	6235G	2994	2832434	2v10h	mt632		1:24000
Spearhead, stony-Pishkun, rubbly families-Rubble land complex, 40 to 70 percent slopes	6236G	2865	2832453	2v10z	mt632		1:24000
Currycreek-Spearhead, extremely stony-Cowood, very stony families, complex, 20 to 50 percent slopes	6233F	1518	2832433	2v10g	mt632		1:24000
Helmville, very stony-Spearhead, very bouldery-Ouselfal, extremely stony families, complex, 2 to 15 percent slopes	6313D	1135	2826841	2tymj	mt632		1:24000
Spearhead, very stony-Tetonville families, complex, 1 to 8 percent slopes	6211C	943	2832432	2v10f	mt632		1:24000
McCadden, extremely stony-Cuberant, extremely stony, Spearhead, very stony families, complex, 25 to 70 percent slopes	6231G	841	2832444	2v10w	mt632		1:24000
Spearhead, stony-Pishkun, rubbly families-Rubble land complex, 40 to 70 percent slopes	6236G	136	3094134	2v10z	mt657	1990	1:24000
Sponsor family-Ezbin-Spearhead family, complex, 25 to 50 percent slopes	995	112	3083490	2wv37	wy623	1971	1:20000
Sponsor family-Ezbin-Spearhead family, complex, 5 to 25 percent slopes	977	10	3083491	2wv38	wy623	1971	1:20000
Geertsen-Surdal-Spearhead families, complex, 15 to 75 percent slopes	217		3250480	595z	wy629		1:24000
Geertsen-Surdal-Spearhead families, complex, 15 to 75 percent slopes	217	11973	157789	595z	wy656	2008	1:24000
Silvercliff-Spearhead-Elwood families, complex, 15-40 percent slopes	209	9518	157785	595v	wy656	2008	1:24000
Surdal-Starman-Spearhead families, complex, 15 to 60 percent slopes	220	2406	157791	5961	wy656	2008	1:24000
Spearhead-Midfork association *	28	3770	153276	54hd	wy666	1978	1:24000

Map of Series Extent

Approximate geographic distribution of the SPEARHEAD soil series. To learn more about how this distribution was mapped, or to compare this soil series extent to others, use the Series Extent Explorer (SEE) application. Source: generalization of SSURGO geometry (updated 2023-10-04).