Soil Data Explorer - TILK

Official Series Description

Lab Data Summary

Aggregate lab data for the TILK soil series. This aggregation is based on all pedons with a current taxon name of TILK, 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 TILK were used in the calculation. Source: KSSL snapshot (updated 2025-01-21). Methods used to assemble the KSSL snapshot used by SoilWeb / SDE

Pedons used in the lab summary:

MLRA	Lab ID	Pedon ID	Taxonname	CI	NSSL / NASIS Reports	Link To SoilWeb GMap
116A	M8821516	1988MO215216	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.5553639,-91.8327722
116A	M8921513	1989MO215013M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.1017583,-91.8931889
116A	M9021530	1990MO215030	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.4086472,-92.1235333
116A	M9121502	1991MO215002	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.1868639,-91.7428417
116A	M9121503	1991MO215003	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.1860111,-91.7423167
116A	M9209948	1992MO099140	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	38.2033884,-90.7628934
116A	M9212303	1992MO123003M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.6208038,-90.1995316
116A	M9221501	1992MO215001	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.1855,-92.1425
116A	M9221502	1992MO215002M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.4233,-91.6976
116A	M9222108	1992MO221008	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	38.1714,-91.0762
116A	M9312316	1993MO123016M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.5086098,-90.4636078
116A	M9312317	1993MO123017M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.5093613,-90.4640274
116A	M9315301	1993MO153001	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	36.6687833,-92.4144528
116A	M9316116	1993MO161016	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.7553,-92.0191
116A	M9422322	1993MO223022M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.0302773,-90.7219467
116A	M9461331	1994MO203031M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.0324028,-91.4677972
116A	M9461332	1994MO203032M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.033325,-91.4786056
116A	M9461344	1994MO203044M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.0500444,-91.2976417
116A	M9422364	1994MO223064	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.1963882,-90.2877808
116A	M9422367	1994MO223067	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.2266655,-90.2624969
116A	M9422376	1994MO223076	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.2391663,-90.2750015
116A	M9560116	1995MO035016M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.0206139,-91.2159611
116A	M9561351	1995MO203051M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.148825,-91.1364667
116A	M9561352	1995MO203052M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.1487472,-91.1372583
116A	M9522331	1995MO223065T	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.1507378,-90.6135712
116A	M9622101	1996MO221018	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	38.0067246,-91.005123
116A	M9709151	1997MO091268	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	36.8783278,-91.9775028
116A	M9722157	1997MO221119	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.8760944,-90.9141472
116A	M9722352	1997MO223218	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.0851326,-90.6529007
116A	M9722340	1997MO223220M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.0929756,-90.6780548
116A	M9961360	1999MO203060M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.1357194,-91.2369806
116A	M9922139	1999MO221241	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	38.0804232,-90.9002601
116A	M0001709	2000MO017009	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.4301567,-89.915596
116A	M0001724	2000MO017024	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.338829,-89.9167557
116A	M0017941	2000MO179041M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.3328944,-91.0769528
116A	M0017942	2000MO179042M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.3324306,-91.0772111
116A	M0017949	2000MO179049M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.334275,-91.0788
116A	M0017951	2000MO179051M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.3349139,-91.0804
116A	M0017956	2000MO179056M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.3217083,-91.0373667
116A	M0114908	2001MO149008M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	36.6743889,-91.5051389
116A	M0122103	2001MO221003	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.9198194,-90.9153028
116A	M0361210	2003MO035010M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	36.9039444,-90.8111667
116A	M0417901	2004MO179001M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.2037917,-91.4213056
116A	M0603505	2006MO035005M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	36.9655,-91.0520278
116A	M0603506	2006MO035006M	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	36.9656389,-91.0510556
116A	19N0561	S2019MO181021	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	36.8009948730469,-90.9427719116211
116A	19N0551	S2019MO181022	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	36.8066024780273,-90.9346084594727
116A	20N0818	S2020MO181008	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	36.6200714111328,-90.9384841918945
116C	M0617904	2006MO179004	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.5422167,-90.8447389
116C	M0617907	2006MO179007	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.5593944,-90.8730194
116C	M0617912	2006MO179012	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.5488056,-90.8477972
116C	M0717904	2007MO179004	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.5483667,-90.8474583
116C	M0717914	2007MO179014	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.5485694,-90.8466389
116C	M0717919	2007MO179019	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.5487083,-90.8458306
116C	M0717930	2007MO179030	Tilk	n/a	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	37.5586167,-90.8753056

Water Balance

Monthly water balance estimated using a leaky-bucket style model for the TILK 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 TILK series. Sketches are arranged according to their subgroup-level taxonomic structure. Source: SSURGO snapshot (updated 2025-10-03), parsed OSD records (updated 2025-10-07) and snapshot of SC database (updated 2025-12-01).

Select annual climate data summaries for the TILK 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 2025-10-08).

Geomorphic description summaries for the TILK 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 2025-10-06).

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

Competing Series

Soil series competing with TILK share the same family level classification in Soil Taxonomy. Source: parsed OSD records (updated 2025-10-07) and snapshot of the SC database (updated 2025-12-01).

Select annual climate data summaries for the TILK 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 2025-10-08).

Geomorphic description summaries for the TILK 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 2025-10-06).

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

Soil series sharing subgroup-level classification with TILK, 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 2025-12-01).

Block Diagrams

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

1. MO-2010-09-08-07 | Madison County - 2005

   Typical pattern of soils and parent material in the Clarksville-Poynor-Firebaugh association (Soil Survey of Madison County, Missouri; 2005).

Map Units

Map units containing TILK 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
Tilk-Secesh complex, 1 to 3 percent slopes, occasionally flooded	76051	8339	2503489	2t7hj	mo017	2004	1:24000
Tilk-Secesh complex, 0 to 3 percent slopes, occasionally flooded	75429	4436	2502808	2vxvf	mo017	2004	1:24000
Tilk, occasionally flooded-Cornwall-Poynor complex, 0 to 15 percent slopes	75428	2158	2502802	2vxvd	mo017	2004	1:24000
Tilk very gravelly coarse sandy loam, 1 to 3 percent slopes, rarely flooded	76050	434	2503480	2t7hf	mo017	2004	1:24000
Tilk very gravelly coarse sandy loam, 0 to 3 percent slopes, rarely flooded	75411	225	2502770	2vxv8	mo017	2004	1:24000
Tilk-Secesh complex, 1 to 3 percent slopes, occasionally flooded	76051	224	2503492	2t7hj	mo023	1982	1:24000
Tilk-Secesh complex, 0 to 3 percent slopes, occasionally flooded	75429	150	2502813	2vxvf	mo023	1982	1:24000
Tilk, occasionally flooded-Cornwall-Poynor complex, 0 to 15 percent slopes	75428	16	2502806	2vxvd	mo023	1982	1:24000
Tilk very gravelly coarse sandy loam, 0 to 3 percent slopes, rarely flooded	75411	1	2502778	2vxv8	mo023	1982	1:24000
Tilk-Secesh complex, 0 to 3 percent slopes, occasionally flooded	75429	17	2502814	2vxvf	mo031	1978	1:24000
Tilk-Secesh complex, 1 to 3 percent slopes, occasionally flooded	76051	8	2503493	2t7hj	mo031	1978	1:24000
Tilk-Secesh complex, 1 to 3 percent slopes, occasionally flooded	76051	16932	2503494	2t7hj	mo035	1988	1:24000
Tilk-Secesh complex, 0 to 3 percent slopes, occasionally flooded	75429	8058	2502815	2vxvf	mo035	1988	1:24000
Tilk very gravelly coarse sandy loam, 0 to 3 percent slopes, rarely flooded	75411	76	2502779	2vxv8	mo035	1988	1:24000
Tilk, occasionally flooded-Cornwall-Poynor complex, 0 to 15 percent slopes	75428	67	2502807	2vxvd	mo035	1988	1:24000
Tilk very gravelly coarse sandy loam, 1 to 3 percent slopes, rarely flooded	76050	34	2503486	2t7hf	mo035	1988	1:24000
Tilk very gravelly coarse sandy loam, 1 to 3 percent slopes, rarely flooded	76050	37	2503481	2t7hf	mo065	1971	1:24000
Tilk very gravelly coarse sandy loam, 0 to 3 percent slopes, rarely flooded	75411	5	2502771	2vxv8	mo065	1971	1:24000
Tilk very gravelly loam, 0 to 2 percent slopes, rarely flooded	75418	3	2537489	2qq14	mo065	1971	1:24000
Secesh-Tilk complex, 1 to 3 percent slopes, occasionally flooded	76047	10437	2673095	2phpv	mo091	2004	1:24000
Secesh-Tilk complex, 0 to 2 percent slopes, occasionally flooded	75420	6054	2537496	2qq16	mo091	2004	1:24000
Tilk very gravelly loam, 1 to 3 percent slopes, rarely flooded	76049	3452	2673096	2phnh	mo091	2004	1:24000
Tilk very gravelly loam, 0 to 2 percent slopes, rarely flooded	75418	459	2537490	2qq14	mo091	2004	1:24000
Tilk-Secesh complex, 1 to 3 percent slopes, occasionally flooded	76051	441	2503490	2t7hj	mo093	1988	1:24000
Tilk-Secesh complex, 0 to 3 percent slopes, occasionally flooded	75429	363	2502809	2vxvf	mo093	1988	1:24000
Tilk very gravelly coarse sandy loam, 1 to 3 percent slopes, rarely flooded	76050	235	2503482	2t7hf	mo093	1988	1:24000
Tilk, occasionally flooded-Cornwall-Poynor complex, 0 to 15 percent slopes	75428	136	2502803	2vxvd	mo093	1988	1:24000
Tilk very gravelly loam, 0 to 2 percent slopes, rarely flooded	75418	107	2673109	2qq14	mo105	1997	1:24000
Tilk very gravelly coarse sandy loam, 1 to 3 percent slopes, rarely flooded	76050	11675	2503483	2t7hf	mo123	1999	1:24000
Tilk very gravelly coarse sandy loam, 0 to 3 percent slopes, rarely flooded	75411	7554	2502773	2vxv8	mo123	1999	1:24000
Tilk very gravelly loam, 1 to 3 percent slopes, rarely flooded	76049	7731	2503479	2phnh	mo149	2004	1:24000
Secesh-Tilk complex, 1 to 3 percent slopes, occasionally flooded	76047	5705	2503476	2phpv	mo149	2004	1:24000
Secesh-Tilk complex, 0 to 2 percent slopes, occasionally flooded	75420	5461	2537499	2qq16	mo149	2004	1:24000
Tilk very gravelly loam, 0 to 2 percent slopes, rarely flooded	75418	709	2537492	2qq14	mo149	2004	1:24000
Tilk very gravelly coarse sandy loam, 0 to 3 percent slopes, rarely flooded	75411	150	2502774	2vxv8	mo157	1983	1:24000
Tilk very gravelly coarse sandy loam, 1 to 3 percent slopes, rarely flooded	76050	101	2508754	2t7hf	mo157	1983	1:24000
Tilk-Secesh complex, 1 to 3 percent slopes, occasionally flooded	76051	4	2508756	2t7hj	mo157	1983	1:24000
Secesh-Tilk complex, 1 to 3 percent slopes, occasionally flooded	76047	27	2673164	2phpv	mo169	1984	1:24000
Tilk very gravelly coarse sandy loam, 1 to 3 percent slopes, rarely flooded	76050	9943	2503484	2t7hf	mo179	2004	1:24000
Tilk, occasionally flooded-Cornwall-Poynor complex, 0 to 15 percent slopes	75428	7723	2502804	2vxvd	mo179	2004	1:24000
Tilk-Secesh complex, 0 to 3 percent slopes, occasionally flooded	75429	4857	2502811	2vxvf	mo179	2004	1:24000
Tilk very gravelly coarse sandy loam, 0 to 3 percent slopes, rarely flooded	75411	3902	2502775	2vxv8	mo179	2004	1:24000
Tilk-Secesh complex, 1 to 3 percent slopes, occasionally flooded	76051	3200	2503491	2t7hj	mo179	2004	1:24000
Tilk-Secesh complex, 1 to 3 percent slopes, occasionally flooded	76051	910	2503495	2t7hj	mo181	1982	1:24000
Tilk-Secesh complex, 0 to 3 percent slopes, occasionally flooded	75429	640	2502816	2vxvf	mo181	1982	1:24000
Tilk very gravelly loam, 1 to 3 percent slopes, rarely flooded	76049	185	2487703	2phnh	mo181	1982	1:24000
Secesh-Tilk complex, 1 to 3 percent slopes, occasionally flooded	76047	105	2503477	2phpv	mo181	1982	1:24000
Tilk very gravelly loam, 0 to 2 percent slopes, rarely flooded	75418	13	2537488	2qq14	mo181	1982	1:24000
Tilk very gravelly coarse sandy loam, 1 to 3 percent slopes, rarely flooded	76050	3	2503487	2t7hf	mo181	1982	1:24000
Tilk very gravelly coarse sandy loam, 1 to 3 percent slopes, rarely flooded	76050	7605	2503488	2t7hf	mo203	2004	1:24000
Secesh-Tilk complex, 1 to 3 percent slopes, occasionally flooded	76047	1747	2487745	2phpv	mo203	2004	1:24000
Tilk very gravelly coarse sandy loam, 0 to 3 percent slopes, rarely flooded	75411	1127	2502781	2vxv8	mo203	2004	1:24000
Secesh-Tilk complex, 0 to 2 percent slopes, occasionally flooded	75420	1074	2537495	2qq16	mo203	2004	1:24000
Secesh-Tilk complex, 1 to 3 percent slopes, occasionally flooded	76047	7245	2673182	2phpv	mo215	2002	1:24000
Secesh-Tilk complex, 0 to 2 percent slopes, occasionally flooded	75420	6400	2537498	2qq16	mo215	2002	1:24000
Tilk very gravelly loam, 0 to 2 percent slopes, rarely flooded	75418	347	2537491	2qq14	mo215	2002	1:24000
Tilk-Secesh complex, 1 to 3 percent slopes, occasionally flooded	76051	21537	2487786	2t7hj	mo223	2004	1:24000
Tilk, occasionally flooded-Cornwall-Poynor complex, 0 to 15 percent slopes	75428	19378	2502805	2vxvd	mo223	2004	1:24000
Tilk-Secesh complex, 0 to 3 percent slopes, occasionally flooded	75429	15596	2502812	2vxvf	mo223	2004	1:24000
Tilk very gravelly coarse sandy loam, 0 to 3 percent slopes, rarely flooded	75411	133	2502777	2vxv8	mo223	2004	1:24000
Tilk very gravelly coarse sandy loam, 1 to 3 percent slopes, rarely flooded	76050	106	2487782	2t7hf	mo223	2004	1:24000

Map of Series Extent

Approximate geographic distribution of the TILK 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 2025-10-19).