Soil Data Explorer - TWILIGHT

Official Series Description

Lab Data Summary

Aggregate lab data for the TWILIGHT soil series. This aggregation is based on all pedons with a current taxon name of TWILIGHT, 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 TWILIGHT were used in the calculation. Source: KSSL snapshot (updated 2020-03-13). 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 TWILIGHT 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 TWILIGHT series. Sketches are arranged according to their subgroup-level taxonomic structure. Source: SSURGO snapshot (updated 2024-02-21), parsed OSD records (updated 2023-10-02) and snapshot of SC database (updated 2023-10-02).

Select annual climate data summaries for the TWILIGHT 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 TWILIGHT 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 mountains figure.

Competing Series

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

Select annual climate data summaries for the TWILIGHT 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 TWILIGHT 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 mountains figure.

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

Soil series sharing subgroup-level classification with TWILIGHT, 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

Click a link below to display the diagram. Note that these diagrams may be from multiple survey areas.

1. SD-2012-03-15-49 | Harding County - December 1988

   Pattern of soils and parent material in the Cabbart-Rock outcrop-Delridge association (Soil Survey of Harding County, SD; 1988).

2. SD-2012-03-15-73 | Meade County, Northern Part - January 1986

   Pattern of soils and parent material in the Assinniboine-Blackhall-Twilight association (Soil Survey of Meade County, Northern Part, SD; 1986).

3. SD-2012-03-15-75 | Meade County, Northern Part - January 1986

   Pattern of soils and parent material in the Bullock-Parchin association (Soil Survey of Meade County, Northern Part, SD; 1986).

Map Units

Map units containing TWILIGHT 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
Blacksheep-Twilight fine sandy loams, complex, 8 to 15 percent slopes	55D	20870	343143	2wbz0	mt011	1992	1:24000
Busby-Twilight-Blacksheep fine sandy loams, 8 to 35 percent slopes	170D	14934	342956	2wbyy	mt011	1992	1:24000
Twilight-Blacksheep fine sandy loams, 15 to 45 percent slopes	55E	13707	343144	2wbz1	mt011	1992	1:24000
Twilight-Bonfri complex, 8 to 15 percent slopes	269D	13608	343060	2yk10	mt011	1992	1:24000
Twilight fine sandy loam, 8 to 15 percent slopes	69D	12752	343212	cj4c	mt011	1992	1:24000
Rentsac-Twilight-Rock outcrop complex, 15 to 45 percent slopes	99F	8894	343298	cj74	mt011	1992	1:24000
Twilight-Cabbart complex, 8 to 15 percent slopes	369D	8008	343092	cj0h	mt011	1992	1:24000
Twilight-Bonfri complex, 2 to 8 percent slopes	269C	6920	343059	2yk0z	mt011	1992	1:24000
Twilight fine sandy loam, 2 to 8 percent slopes	69C	5060	343211	cj4b	mt011	1992	1:24000
Twilight-Delpoint complex, 2 to 8 percent slopes	369C	2268	343091	cj0g	mt011	1992	1:24000
Chinook-Twilight fine sandy loams, 2 to 12 percent slopes	352D	26234	343400	cjbf	mt017	1995	1:24000
Busby-Twilight fine sandy loams, 2 to 15 percent slopes	277D	20911	343363	cj97	mt017	1995	1:24000
Busby-Twilight-Blacksheep fine sandy loams, 8 to 35 percent slopes	271E	16317	343356	2wbyy	mt017	1995	1:24000
Chinook-Twilight-Eapa complex, 2 to 8 percent slopes	355C	13563	343403	cjbj	mt017	1995	1:24000
Twilight-Blacksheep-Busby fine sandy loams, 8 to 45 percent slopes	921F	6513	343755	cjpw	mt017	1995	1:24000
Chinook-Lihill-Twilight complex, 8 to 15 percent slopes	357D	4580	343404	cjbk	mt017	1995	1:24000
Chinook-Twilight fine sandy loams, 2 to 8 percent slopes	965C	525	343812	cjrq	mt017	1995	1:24000
Chinook-Twilight-Blacksheep fine sandy loams, 8 to 15 percent slopes	966D	433	343814	cjrs	mt017	1995	1:24000
Busby-Twilight-Blacksheep fine sandy loams, 2 to 8 percent slopes	651C	9	343608	cjk4	mt017	1995	1:24000
Twilight-Yetull complex, 8 to 25 percent slopes	Dc	19090	342007	cgwh	mt021	1971	1:24000
Twilight-Yetull complex, 2 to 8 percent slopes	Db	6182	342006	cgwg	mt021	1971	1:24000
Twilight fine sandy loam, 2 to 8 percent slopes	Da	4322	342005	cgwf	mt021	1971	1:24000
Blacksheep-Twilight fine sandy loams, complex, 8 to 15 percent slopes	55D	17117	342245	2wbz0	mt025	1991	1:24000
Busby-Twilight-Blacksheep fine sandy loams, 8 to 35 percent slopes	170D	14418	342124	2wbyy	mt025	1991	1:24000
Twilight-Cabbart complex, 8 to 15 percent slopes	369D	11243	342211	ch32	mt025	1991	1:24000
Twilight fine sandy loam, 2 to 8 percent slopes	69C	6040	342272	ch51	mt025	1991	1:24000
Twilight fine sandy loam, 8 to 15 percent slopes	69D	5364	342273	ch52	mt025	1991	1:24000
Twilight-Blacksheep fine sandy loams, 15 to 45 percent slopes	55E	4925	2942846	2wbz1	mt025	1991	1:24000
Twilight-Delpoint complex, 2 to 8 percent slopes	369C	4791	342210	ch31	mt025	1991	1:24000
Twilight-Bonfri complex, 8 to 15 percent slopes	269D	2663	342180	2yk10	mt025	1991	1:24000
Twilight-Bonfri complex, 2 to 8 percent slopes	269C	2573	342179	2yk0z	mt025	1991	1:24000
Busby-Twilight-Blacksheep fine sandy loams, 8 to 35 percent slopes	314E	65037	342624	2wbyy	mt033	2002	1:24000
Cambeth-Twilight-Cabbart complex, 4 to 15 percent slopes	375D	51197	342638	2zg5p	mt033	2002	1:24000
Chinook-Twilight fine sandy loams, 2 to 15 percent slopes	382D	45023	342643	chk0	mt033	2002	1:24000
Twilight-Blacksheep fine sandy loams, 15 to 45 percent slopes	316F	39557	342626	2wbz1	mt033	2002	1:24000
Busby-Twilight-Cabbart association, wooded, 8 to 35 percent slopes	1017F	36096	342611	chhz	mt033	2002	1:24000
Chinook-Twilight-Eapa complex, 2 to 8 percent slopes	383C	32667	342644	chk1	mt033	2002	1:24000
Busby-Blacksheep-Twilight fine sandy loams, 2 to 15 percent slopes	311D	17409	342622	chjb	mt033	2002	1:24000
Busby-Twilight fine sandy loams, 2 to 15 percent slopes	313D	12351	342623	chjc	mt033	2002	1:24000
Cabbart-Twilight complex, 15 to 45 percent slopes	352F	5369	339943	cdqx	mt033	2002	1:24000
Yamacall-Twilight-Blacksheep complex, 8 to 15 percent slopes	983D	4504	342721	chmj	mt033	2002	1:24000
Busby-Twilight-Fleak complex, 8 to 15 percent slopes	318D	734	342736	chn0	mt033	2002	1:24000
Yamacall-Twilight-Fleak complex, 8 to 15 percent slopes	987D	507	342816	chql	mt033	2002	1:24000
Yamacall-Twilight complex, 2 to 8 percent slopes	986C	355	342815	chqk	mt033	2002	1:24000
Busby-Twilight-Blacksheep fine sandy loams, 2 to 8 percent slopes	317C	307	342779	chpd	mt033	2002	1:24000
Twilight-Yetull fine sandy loams, 8 to 15 percent slopes	916D	222	339751	cdjq	mt033	2002	1:24000
Busby-Twilight fine sandy loams, 2 to 8 percent slopes	319C	79	339741	cdjd	mt033	2002	1:24000
Busby-Twilight-Blacksheep fine sandy loams, 4 to 15 percent slopes	314D	22	342747	chnc	mt033	2002	1:24000
Twilight-Blacksheep fine sandy loams, 2 to 8 percent slopes	661C	2894	344022	cjzh	mt041	1994	1:24000
Twilight-Blacksheep fine sandy loams, 2 to 8 percent slopes	661C	218	344241	ck6k	mt051	1992	1:24000
Cambeth-Twilight-Cabbart complex, 4 to 15 percent slopes	43	38058	344406	2zg5p	mt055	1981	1:24000
Cabbart-Twilight complex, 15 to 45 percent slopes	34	18282	344396	ckck	mt055	1981	1:24000
Busby-Twilight-Fleak complex, 8 to 15 percent slopes	22	14766	344383	ckc4	mt055	1981	1:24000
Yamacall-Twilight-Fleak complex, 8 to 15 percent slopes	163	8005	344364	ckbj	mt055	1981	1:24000
Yamacall-Twilight complex, 2 to 8 percent slopes	162	5717	344363	ckbh	mt055	1981	1:24000
Twilight-Yetull fine sandy loams, 8 to 15 percent slopes	142	4551	344341	ck9s	mt055	1981	1:24000
Busby-Twilight fine sandy loams, 2 to 8 percent slopes	21	3391	344382	ckc3	mt055	1981	1:24000
Twilight-Blacksheep sandy loams, 2 to 8 percent slopes	132B	15199	344475	2xrsb	mt065	1996	1:24000
Blacksheep-Twilight sandy loams, 8 to 45 percent slopes	243F	9836	344519	ckhj	mt065	1996	1:24000
Twilight-Blacksheep-Rock outcrop complex, 4 to 35 percent slopes	241E	9257	344516	ckhf	mt065	1996	1:24000
Twilight-Blacksheep-Rock outcrop, complex, 4 to 25 percent slopes	32D	7022	344568	cgjq	mt065	1996	1:24000
Twilight sandy loam, 2 to 8 percent slopes	32B	3422	344567	cgjp	mt065	1996	1:24000
Blacksheep-Rock outcrop-Twilight complex, 8 to 45 percent slopes	80E	1046	344626	cgl5	mt065	1996	1:24000
Blacksheep-Twilight complex, 4 to 25 percent slopes	83E	281	1913584	21r6c	mt065	1996	1:24000
Busby-Twilight fine sandy loams, 2 to 8 percent slopes	130B	105	360767	pl25	mt065	1996	1:24000
Twilight-Blacksheep sandy loams, 2 to 8 percent slopes	79	17588	344750	2xrsb	mt069	1989	1:24000
Twilight-Blackhall-Rock outcrop complex, 4 to 25 percent slopes	80	11903	344752	ckr1	mt069	1989	1:24000
Busby-Twilight fine sandy loams, 2 to 8 percent slopes	13	6701	344678	pl25	mt069	1989	1:24000
Blackhall-Rock outcrop-Twilight complex, 8 to 45 percent slopes	10	5021	344670	cknd	mt069	1989	1:24000
Twilight sandy loam, 2 to 8 percent slopes	78	1233	344749	ckqy	mt069	1989	1:24000
Chinook-Twilight fine sandy loams, 2 to 8 percent slopes	37	6095	344892	ckwk	mt079	1986	1:24000
Chinook-Twilight-Blackhall fine sandy loams, 8 to 15 percent slopes	38	5310	344893	ckwl	mt079	1986	1:24000
Cambeth-Twilight-Cabbart complex, 4 to 15 percent slopes	150	5284	2451188	2zg5p	mt079	1986	1:24000
Busby-Blackhall-Twilight fine sandy loams, 8 to 25 percent slopes	15	4704	344826	cktf	mt079	1986	1:24000
Busby-Twilight-Blackhall fine sandy loams, 4 to 15 percent slopes	16	4320	344827	cktg	mt079	1986	1:24000
Yetull-Twilight complex, 4 to 15 percent slopes	161	1114	2451205	2n8p4	mt079	1986	1:24000
Blacksheep-Twilight fine sandy loams, 15 to 40 percent slopes	Tp	10011	345510	2zg59	mt103	1961	1:20000
Blacksheep-Twilight complex, 4 to 25 percent slopes	83E	9	1946666	23bnp	mt103	1961	1:20000
Blacksheep-Twilight complex, 4 to 25 percent slopes	83E	27410	1899133	21r6c	mt111	1966	1:20000
Twilight-Blacksheep-Rock outcrop, complex, 4 to 25 percent slopes	32D	99	1913542	cgjq	mt111	1966	1:20000
Twilight sandy loam, 2 to 8 percent slopes	32B	10	1946663	cgjp	mt111	1966	1:20000
Blacksheep-Twilight complex, 4 to 25 percent slopes	83E	90	2432431	2mn4j	mt607	1970	1:24000
Twilight-Riedel fine sandy loams, 8 to 20 percent slopes	128	3084	346282	cmbd	mt608	1976	1:24000
Twilight-Riedel fine sandy loams, 4 to 8 percent slopes	127	2801	346281	cmbc	mt608	1976	1:24000
Twilight-Fleak complex, 8 to 25 percent slopes	661E	7429	346875	cmyj	mt615	1992	1:24000
Fleak-Twilight-Rock outcrop complex, 25 to 70 percent slopes	654F	6744	346873	cmyg	mt615	1992	1:24000
Fleak-Twilight-Yetull complex, 25 to 70 percent slopes	653F	4942	346872	cmyf	mt615	1992	1:24000
Busby-Twilight fine sandy loams, 4 to 15 percent slopes	941D	3862	346986	cn23	mt615	1992	1:24000
Twilight-Blacksheep sandy loams, 2 to 8 percent slopes	132B	4100	3176860	2xrsb	mt624	2021	1:24000
Blacksheep-Twilight complex, 8 to 35 percent slopes	80E	597	347512	cnm2	mt624	2021	1:24000
Twilight-Blacksheep-Rock outcrop, complex, 4 to 25 percent slopes	32D	7	2513699	cgjq	mt624	2021	1:24000
Twilight-Blacksheep sandy loams, 2 to 8 percent slopes	156C	440	3155641	cghn	mt639	2000	1:24000
Chinook-Twilight fine sandy loams, 8 to 25 percent slopes	376E	243	149939	510r	mt639	2000	1:24000
Cabbart-Twilight-Yawdim association, 8 to 35 percent slopes	1021E	22834	347557	cnnj	mt641	1994	1:24000
Twilight-Cabbart-Marmarth association, 4 to 15 percent slopes	1066D	6563	347569	cnnx	mt641	1994	1:24000
Cabbart-Twilight-Delpoint association, 25 to 70 percent slopes	1850F	5365	347618	cnqh	mt641	1994	1:24000
Bonfri-Twilight-Blacksheep fine sandy loams, wooded, 3 to 30 percent slopes	259	38	1387752	1hl26	mt643	1967	1:20000
Busby-Twilight-Blacksheep fine sandy loams, 8 to 35 percent slopes	49	56542	348080	2wbyy	mt649	1985	1:24000
Twilight-Blacksheep fine sandy loams, 15 to 45 percent slopes	178	15345	348006	2wbz1	mt649	1985	1:24000
Busby-Twilight-Blackhall, warm, fine sandy loams, 2 to 8 percent slopes	48	12915	348079	cp6c	mt649	1985	1:24000
Twilight-Blacksheep sandy loams, 2 to 8 percent slopes	132B	1148	1712562	2xrsb	mt655	1975	1:24000
Busby-Twilight fine sandy loams, 2 to 8 percent slopes	235C	185	1712566	1vh22	mt655	1975	1:24000
Blacksheep-Rock outcrop-Twilight complex, 8 to 45 percent slopes	80E	182	1712553	1vh1n	mt655	1975	1:24000
Blacksheep-Twilight-Busby complex, 8 to 25 percent slopes	283E	29	1712567	1vh23	mt655	1975	1:24000
Twilight-Rentsac complex, 2 to 8 percent slopes	381C	5279	348607	cprd	mt657	1990	1:24000
Twilight-Yetull-Rock outcrop complex, 8 to 25 percent slopes	181E	4719	348403	cpjt	mt657	1990	1:24000
Chinook-Twilight fine sandy loams, 2 to 15 percent slopes	534D	2956	348708	cpvn	mt657	1990	1:24000
Twilight-Chinook-Yetull complex, 2 to 8 percent slopes	281C	1666	348530	cpnx	mt657	1990	1:24000
Twilight-Blacksheep sandy loams, 2 to 8 percent slopes	132B	10671	341640	2xrsb	mt666	2008	1:24000
Twilight-Blacksheep-Rock outcrop, complex, 4 to 25 percent slopes	32D	8942	341673	cgjq	mt666	2008	1:24000
Blacksheep-Rock outcrop-Twilight complex, 8 to 45 percent slopes	80E	5636	341718	cgl5	mt666	2008	1:24000
Blacksheep-Twilight-Busby complex, 8 to 25 percent slopes	283E	1884	339995	cdsl	mt666	2008	1:24000
Busby-Twilight fine sandy loams, 2 to 8 percent slopes	235C	1485	642976	pl25	mt666	2008	1:24000
Twilight sandy loam, 2 to 8 percent slopes	32B	1151	341672	cgjp	mt666	2008	1:24000
Twilight-Assinniboine fine sandy loams, 3 to 9 percent slopes	TgC	28601	353250	cvl5	sd019	1970	1:24000
Twilight fine sandy loam, 3 to 25 percent slopes	TfD	24846	353249	cvl4	sd019	1970	1:24000
Twilight-Blackhall fine sandy loams, 6 to 18 percent slopes	ThD	11770	353251	cvl6	sd019	1970	1:24000
Twilight-Parchin fine sandy loams, 6 to 15 percent slopes	TyC	84858	355805	2wf3p	sd063	1984	1:24000
Twilight-Blackhall fine sandy loams, 9 to 25 percent slopes	TxE	78958	355804	2wf3n	sd063	1984	1:24000
Twilight fine sandy loam, 6 to 9 percent slopes	TwC	33855	355803	2wf3m	sd063	1984	1:24000
Marmarth-Twilight fine sandy loams, 6 to 9 percent slopes	MtC	11613	355769	2zj4j	sd063	1984	1:24000
Marmarth-Twilight fine sandy loams, 9 to 15 percent slopes	MtD	5007	355770	2y6dh	sd063	1984	1:24000
Twilight-Marmarth-Parchin fine sandy loams, 3 to 9 percent slopes	TwC	123073	354666	2wfqm	sd105	1977	1:24000
Twilight-Marmarth-Parchin fine sandy loams, 3 to 9 percent slopes	TwC	63451	355473	2wfqm	sd601	1983	1:24000
Blackhall-Twilight fine sandy loams, 9 to 40 percent slopes	BmE	45297	355424	cxv9	sd601	1983	1:24000
Assinniboine-Twilight fine sandy loams, 6 to 9 percent slopes	AtC	31742	355420	cxv5	sd601	1983	1:24000
Bonfri-Twilight-Blacksheep fine sandy loams, wooded, 3 to 30 percent slopes	219	366	780116	v5s1	wy011	1978	1:24000
Bonfri-Twilight-Blacksheep fine sandy loams, wooded, 3 to 30 percent slopes	259	1329	817647	wftq	wy705	2003	1:24000
Toby-Twilight-Blacksheep fine sandy loams, 3 to 30 percent slopes	322	583	817608	wfsg	wy705	2003	1:24000

Map of Series Extent

Approximate geographic distribution of the TWILIGHT 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).