Soil Taxonomy Classification

Transcription

1 1A Fluvaquents-Udifluvents complex, 0 to 3 Mixed, mesic Fluvaquents 45, frequently flooded 2A Geneseo silty clay loam, 0 to 3 Fine-silty, mixed, active, mesic Oxyaquic Eutrudepts 3A Hemlock silty clay loam, 0 to 3 Fine-silty, mixed, active, mesic Fluvaquentic Eutrudepts 4A Naples Creek silty clay loam, 0 to 3 Fine-silty, mixed, active, nonacid, mesic Fluventic 5A Wayland soils complex, 0 to 3, Fine-silty, mixed, active, nonacid, mesic Fluvaquentic frequently flooded 12D Rockrift channery silt loam, 15 to 25 Loamy-skeletal, mixed, active, frigid Typic 13F Rock outcrop-arnot complex, 25 to D Cadosia channery silt loam, 15 to 25 Loamy-skeletal, mixed, active, mesic Typic 15A Guyanoga channery silt loam, fan, 0 to 3 Loamy-skeletal, mixed, active, mesic Dystric Eutrudepts 15B Guyanoga channery silt loam, fan, 3 to 8 Loamy-skeletal, mixed, active, mesic Dystric Eutrudepts 16A Almond channery silt loam, 0 to 3 Fine-loamy, mixed, semiactive, acid, frigid Aeric 80 16B Almond channery silt loam, 3 to 8 Fine-loamy, mixed, semiactive, acid, frigid Aeric 80 16C Almond channery silt loam, 8 to 15 Fine-loamy, mixed, semiactive, acid, frigid Aeric 80 18A Homer fine sandy loam, 0 to 3 Fine-loamy over sandy or sandy-skeletal, mixed, active, mesic Aeric Endoaqualfs 19A Fine-loamy, mixed, active, mesic, Typic Argiaquolls, Fine-loamy, mixed, active, mesic Typic Argiaquolls 80 0 to 3 20A Atherton and Fine-loamy, mixed, active, mesic, Typic Fine-loamy, mixed, active, mesic Typic Argiaquolls 40 Argiaquolls, 0 to 3 24A Howard gravelly loam, 0 to 3 Loamy-skeletal, mixed, active, 80 24B Howard gravelly loam, 3 to 8 Loamy-skeletal, mixed, active, 80 24C Howard gravelly loam, 8 to 15 Loamy-skeletal, mixed, active, 80 24D Howard soils, 15 to 25 Loamy-skeletal, mixed, active, 65 25A Chenango gravelly loam, 0 to 3 Loamy-skeletal, mixed, superactive, mesic Typic 25B Chenango gravelly loam, 3 to 8 Loamy-skeletal, mixed, superactive, mesic Typic 25C Chenango gravelly loam, 8 to 15 Loamy-skeletal, mixed, superactive, mesic Typic 25D Chenango gravelly loam, 15 to 25 Loamy-skeletal, mixed, superactive, mesic Typic 25E Chenango gravelly loam, 25 to 35 Loamy-skeletal, mixed, superactive, mesic Typic 26B Chenango channery loam, fan, 3 to 8 Loamy-skeletal, mixed, superactive, mesic Typic 27B Castile gravelly silt loam, 3 to 8 Loamy-skeletal, mixed, active, mesic Aquic 31A Collamer silt loam, 0 to 3 Fine-silty, mixed, semiactive, mesic Glossaquic Hapludalfs 31B Collamer silt loam, 3 to 8 Fine-silty, mixed, semiactive, mesic Glossaquic Hapludalfs 31C Collamer silt loam, 8 to 15 Fine-silty, mixed, semiactive, mesic Glossaquic Hapludalfs 31D Collamer silt loam, 15 to 25 Fine-silty, mixed, semiactive, mesic Glossaquic Hapludalfs 32A Dunkirk fine sandy loam, 0 to 3 Fine-silty, mixed, active, 32B Dunkirk fine sandy loam, 3 to 8 Fine-silty, mixed, active, 33A Dunkirk silt loam, 0 to 3 Fine-silty, mixed, active, 33B Dunkirk silt loam, 3 to 8 Fine-silty, mixed, active, Page 1 of 8

2 33C Dunkirk silt loam, 8 to 15 Fine-silty, mixed, active, 33D Dunkirk silt loam, 15 to 25 Fine-silty, mixed, active, 33E Dunkirk silt loam, 25 to 35 Fine-silty, mixed, active, 34A Lakemont silty clay loam, 0 to 3 Fine, illitic, mesic Udollic Endoaqualfs 35A Odessa silt loam, 0 to 3 Fine, illitic, mesic Aeric Endoaqualfs 35B Odessa silty clay loam, 3 to 8 Fine, illitic, mesic Aeric Endoaqualfs 36A Schoharie silty clay loam, 0 to 3 Fine, illitic, mesic Oxyaquic Hapludalfs 36B Schoharie silty clay loam, 3 to 8 Fine, illitic, mesic Oxyaquic Hapludalfs 36C Schoharie silty clay loam, 8 to 15 Fine, illitic, mesic Oxyaquic Hapludalfs 36D Schoharie silty clay loam, 15 to 25 Fine, illitic, mesic Oxyaquic Hapludalfs 36E Schoharie silty clay loam, 25 to 45 Fine, illitic, mesic Oxyaquic Hapludalfs 37A Schoharie silt loam, 0 to 3 Fine, illitic, mesic Oxyaquic Hapludalfs 37B Schoharie silt loam, 3 to 8 Fine, illitic, mesic Oxyaquic Hapludalfs 38A Niagara silt loam, 0 to 3 Fine-silty, mixed, active, mesic Aeric Endoaqualfs 38B Niagara silt loam, 3 to 8 Fine-silty, mixed, active, mesic Aeric Endoaqualfs 39A Rhinebeck silty clay loam, 0 to 3 Fine, illitic, mesic Aeric Endoaqualfs 41A Aeric Epiaquepts, 0 to 3 Coarse-loamy over clayey, mixed, semiactive, nonacid, mesic Aeric Epiaquepts 43A Canandaigua silt loam, 0 to 3 Fine-silty, mixed, active, nonacid, mesic Aeric 44A Canandaigua mucky silt loam, 0 to 3 Fine-silty, mixed, active, nonacid, mesic Typic Endoaquolls 45A Fonda mucky silt loam, 0 to 3 Fine, illitic, nonacid, mesic Mollic 46A Galen fine sandy loam, 0 to 3 Coarse-loamy, mixed, active, mesic Oxyaquic Hapludalfs 46B Galen fine sandy loam, 3 to 8 Coarse-loamy, mixed, active, mesic Oxyaquic Hapludalfs 48A Arkport fine sandy loam, 0 to 3 Coarse-loamy, mixed, active, mesic Lamellic Hapludalfs 48B Arkport fine sandy loam, 3 to 8 Coarse-loamy, mixed, active, mesic Lamellic Hapludalfs 48C Arkport fine sandy loam, 8 to 15 Coarse-loamy, mixed, active, mesic Lamellic Hapludalfs 48D Arkport fine sandy loam, 15 to 25 Coarse-loamy, mixed, active, mesic Lamellic Hapludalfs 49B Arkport loamy fine sand, 3 to 8 Coarse-loamy, mixed, active, mesic Lamellic Hapludalfs 49D Arkport loamy fine sand, 15 to 25 Coarse-loamy, mixed, active, mesic Lamellic Hapludalfs 49E Arkport loamy fine sand, 25 to 35 Coarse-loamy, mixed, active, mesic Lamellic Hapludalfs 49F Arkport loamy fine sand, 35 to 55 Coarse-loamy, mixed, active, mesic Lamellic Hapludalfs 50B Dunkirk-Arkport complex, 3 to 8 Fine-silty, mixed, active, 50 50C Dunkirk-Arkport complex, 8 to 15 Fine-silty, mixed, active, 60 50D Dunkirk-Arkport complex, 15 to 25 Fine-silty, mixed, active, 60 53A Lamson fine sandy loam, 0 to 3 Coarse-loamy, mixed, active, nonacid, mesic Aeric 54A Lamson mucky fine sandy loam, 0 to 3 Coarse-loamy, mixed, active, nonacid, mesic Aeric 56A Elnora loamy fine sand, 0 to 3 Mixed, mesic Aquic Udipsamments 58B Colonie loamy fine sand, 3 to 8 Mixed, mesic Lamellic Udipsamments 58C Colonie loamy fine sand, 8 to 15 Mixed, mesic Lamellic Udipsamments 62B Mardin channery silt loam, 3 to 8 Coarse-loamy, mixed, active, mesic Typic Fragiudepts 62C Mardin channery silt loam, 8 to 15 Coarse-loamy, mixed, active, mesic Typic Fragiudepts 93 62D Mardin channery silt loam, 15 to 25 Coarse-loamy, mixed, active, mesic Typic Fragiudepts 62E Mardin channery silt loam, 25 to 35 Coarse-loamy, mixed, active, mesic Typic Fragiudepts 88 63B Langford channery silt loam, 3 to 8 Fine-loamy, mixed, active, mesic Typic Fragiudepts 63C Langford channery silt loam, 8 to 15 pecent Fine-loamy, mixed, active, mesic Typic Fragiudepts 63D Langford channery silt loam, 15 to 25 Fine-loamy, mixed, active, mesic Typic Fragiudepts Page 2 of 8

3 64B Langford-Erie channery silt loams, 3 to 8 Fine-loamy, mixed, active, mesic Typic Fragiudepts 55 66A Lyons soils, 0 to 3 Fine-loamy, mixed, active, nonacid, mesic Mollic 68A Volusia channery silt loam, 0 to 3 Fine-loamy, mixed, active, mesic Aeric Fragiaquepts 68B Volusia channery silt loam, 3 to 8 Fine-loamy, mixed, active, mesic Aeric Fragiaquepts 68C Volusia channery silt loam, 8 to 15 Fine-loamy, mixed, active, mesic Aeric Fragiaquepts 68D Volusia channery silt loam, 15 to 25 Fine-loamy, mixed, active, mesic Aeric Fragiaquepts 69A Erie channery silt loam, 0 to 3 Fine-loamy, mixed, active, mesic Aeric Fragiaquepts B Erie channery silt loam, 3 to 8 Fine-loamy, mixed, active, mesic Aeric Fragiaquepts C Erie channery silt loam, 8 to 15 Fine-loamy, mixed, active, mesic Aeric Fragiaquepts A Darien silt loam, 0 to 3 Fine-loamy, mixed, active, mesic Aeric Endoaqualfs 96 71B Darien silt loam, 3 to 8 Fine-loamy, mixed, active, mesic Aeric Endoaqualfs 96 71C Darien silt loam, 8 to 15 Fine-loamy, mixed, active, mesic Aeric Endoaqualfs 96 72A Darien-Ilion silt loams, 0 to 3 Fine-loamy, mixed, active, mesic Aeric Endoaqualfs 73 72B Darien-Ilion silt loams, 3 to 8 Fine-loamy, mixed, active, mesic Aeric Endoaqualfs 73 73B Gretor silt loam, 3 to 8 Fine-loamy, mixed, active, acid, frigid Aeric C Gretor silt loam, 8 to 15 Fine-loamy, mixed, active, acid, frigid Aeric D Gretor channery silt loam, 15 to 25 Fine-loamy, mixed, active, acid, frigid Aeric 92 76B Orpark silt loam, 3 to 8 Fine-loamy, mixed, semiactive, acid, mesic Aeric C Orpark silt loam, 8 to 15 Fine-loamy, mixed, semiactive, acid, mesic Aeric D Orpark channery silt loam, 15 to 25 Fine-loamy, mixed, semiactive, acid, mesic Aeric 77A Chippewa silt loam, 0 to 3 Fine-loamy, mixed, active, mesic Typic Fragiaquepts 77B Chippewa silt loam, 3 to 8 Fine-loamy, mixed, active, mesic Typic Fragiaquepts 82B Manlius channery silt loam, 3 to 8 Loamy-skeletal, mixed, active, mesic Typic 82C Manlius channery silt loam, 8 to 15 Loamy-skeletal, mixed, active, mesic Typic 82D Manlius channery silt loam, 15 to 25 Loamy-skeletal, mixed, active, mesic Typic 91A Palms muck, 0 to 3 Loamy, mixed, euic, mesic Terric Haplosaprists 92A Carlisle muck, 0 to 3 Euic, mesic Typic Haplosaprists 93A Edwards muck, 0 to 3 Marly, euic, mesic Limnic Haplosaprists 94A Martisco muck, 0 to 3 Fine-silty, carbonatic, mesic Histic Humaquepts A Saprists, 0 to 3, inundated Saprists 101A Honeoye loam, 0 to 3 Fine-loamy, mixed, semiactive, 101B Honeoye loam, 3 to 8 Fine-loamy, mixed, semiactive, 101C Honeoye loam, 8 to 15 Fine-loamy, mixed, semiactive, 101D Honeoye loam, 15 to 25 Fine-loamy, mixed, semiactive, 101E Honeoye loam, 25 to 35 Fine-loamy, mixed, semiactive, 104A Honeoye loam, 0 to 3, lower clay Fine-loamy, mixed, semiactive, surface 104B Honeoye loam, 3 to 8, lower clay Fine-loamy, mixed, semiactive, surface 104C Honeoye loam, 8 to 15, lower clay Fine-loamy, mixed, semiactive, surface 106B Danley-Lansing complex, 3 to 8 Fine-loamy, mixed, active, mesic Glossaquic Hapludalfs B Conesus-Lansing complex, 3 to 8 Fine-loamy, mixed, active, mesic Glossaquic Hapludalfs C Lansing loam, 8 to 15 Fine-loamy, mixed, active, D Lansing loam, 15 to 25 Fine-loamy, mixed, active, 88 Page 3 of 8

4 108E Lansing loam, 25 to 35 Fine-loamy, mixed, active, 112B Ontario fine sandy loam, 3 to 8 Fine-loamy, mixed, active, 112C Ontario fine sandy loam, 8 to 15 Fine-loamy, mixed, active, 112D Ontario fine sandy loam, 15 to 25 Fine-loamy, mixed, active, 112E Ontario fine sandy loam, 25 to 35 Fine-loamy, mixed, active, B Ontario gravelly loam, 3 to 8 Fine-loamy, mixed, active, C Ontario gravelly loam, 8 to 15 Fine-loamy, mixed, active, 114D Ontario gravelly loam, 15 to 25 Fine-loamy, mixed, active, 116B Ontario loam, 3 to 8 Fine-loamy, mixed, active, 116C Ontario loam, 8 to 15 Fine-loamy, mixed, active, 116D Ontario loam, 15 to 25 Fine-loamy, mixed, active, 118F Ontario, Honeoye, and Lansing soils, 35 to 55 Fine-loamy, mixed, active, E Palmyra and Howard soils, 25 to 45 Fine-loamy over sandy or sandy-skeletal, mixed, active, A Palmyra cobbly loam, 0 to 3 Fine-loamy over sandy or sandy-skeletal, mixed, active, 122B Palmyra cobbly loam, 3 to 8 Fine-loamy over sandy or sandy-skeletal, mixed, active, 124A Palmyra fine sandy loam, 0 to 3 Fine-loamy over sandy or sandy-skeletal, mixed, active, 124B Palmyra fine sandy loam, 3 to 8 Fine-loamy over sandy or sandy-skeletal, mixed, active, 126A Palmyra gravelly loam, 0 to 3 Fine-loamy over sandy or sandy-skeletal, mixed, active, 126B Palmyra gravelly loam, 3 to 8 Fine-loamy over sandy or sandy-skeletal, mixed, active, 126C Palmyra gravelly loam, 8 to 15 Fine-loamy over sandy or sandy-skeletal, mixed, active, 126D Palmyra gravelly loam, 15 to 25 Fine-loamy over sandy or sandy-skeletal, mixed, active, 128A Palmyra gravelly sandy loam, 0 to 3 Fine-loamy over sandy or sandy-skeletal, mixed, active, 128B Palmyra gravelly sandy loam, 3 to 8 Fine-loamy over sandy or sandy-skeletal, mixed, active, 128C Palmyra gravelly sandy loam, 8 to 15 Fine-loamy over sandy or sandy-skeletal, mixed, active, 130A Farmington loam, 0 to 3 Loamy, mixed, active, mesic Lithic Eutrudepts 130B Farmington loam, 3 to 8 Loamy, mixed, active, mesic Lithic Eutrudepts 132A Galoo loam, 0 to 3, rocky Loamy, mixed, active, nonacid, mesic Lithic Udorthents 132B Galoo loam, 3 to 8, rocky Loamy, mixed, active, nonacid, mesic Lithic Udorthents 134A Camillus silt loam, 0 to 3 Fine-loamy, mixed, active, mesic Typic Eutrudepts 134B Camillus silt loam, 3 to 8 Fine-loamy, mixed, active, mesic Typic Eutrudepts 151C Willdin-Norchip complex, 3 to 15 Coarse-loamy, mixed, active, frigid Typic Fragiudepts B Valois gravelly loam, 3 to 8 Fine-loamy, mixed, superactive, mesic Typic 152C Valois gravelly loam, 8 to 15 Fine-loamy, mixed, superactive, mesic Typic 152D Valois gravelly loam, 15 to 25 Fine-loamy, mixed, superactive, mesic Typic 152E Valois gravelly loam, 25 to 35 Fine-loamy, mixed, superactive, mesic Typic 153B Valois gravelly loam, cool, 3 to 8 Fine-loamy, mixed, superactive, frigid Typic 153C Valois gravelly loam, cool, 8 to 15 Fine-loamy, mixed, superactive, frigid Typic 153D Valois gravelly loam, cool, 15 to 25 Fine-loamy, mixed, superactive, frigid Typic Page 4 of 8

5 153E Valois gravelly loam, cool, 25 to 35 Fine-loamy, mixed, superactive, frigid Typic 162B Willdin channery silt loam, 3 to 8 Coarse-loamy, mixed, active, frigid Typic Fragiudepts 162C Willdin channery silt loam, 8 to 15 Coarse-loamy, mixed, active, frigid Typic Fragiudepts 162D Willdin channery silt loam, 15 to 25 Coarse-loamy, mixed, active, frigid Typic Fragiudepts A Ontusia channery silt loam, 0 to 3 Fine-loamy, mixed, active, frigid Aeric Fragiaquepts B Ontusia channery silt loam, 3 to 8 Fine-loamy, mixed, active, frigid Aeric Fragiaquepts 168C Ontusia channery silt loam, 8 to 15 Fine-loamy, mixed, active, frigid Aeric Fragiaquepts 168D Ontusia channery silt loam, 15 to 25 Fine-loamy, mixed, active, frigid Aeric Fragiaquepts C Lordstown-Manlius-Towerville complex, 8 to 15 Loamy-skeletal, mixed, active, mesic Typic D Lordstown-Manlius-Towerville complex, 15 to 25 Loamy-skeletal, mixed, active, mesic Typic 70, very stony 171E Lordstown-Manlius-Towerville complex, 25 to 35 Loamy-skeletal, mixed, active, mesic Typic 70, extremely stony 171F Lordstown-Manlius-Towerville complex, 35 to 80 Loamy-skeletal, mixed, active, mesic Typic 70, extremely stony 177A Norchip silt loam, 0 to 3 Fine-loamy, mixed, active, frigid Aeric Fragiaquepts B Norchip silt loam, 3 to 8 Fine-loamy, mixed, active, frigid Aeric Fragiaquepts B Mongaup-Ischua complex, 3 to 8 Loamy-skeletal, mixed, active, frigid Typic C Mongaup-Ischua complex, 8 to 15 Loamy-skeletal, mixed, active, frigid Typic D Mongaup-Ischua complex, 15 to 25, Loamy-skeletal, mixed, active, frigid Typic 55 very stony 181E Mongaup-Ischua complex, 25 to 35, Loamy-skeletal, mixed, active, frigid Typic 55 extremely stony 182B Mongaup channery loam, 3 to 8 Loamy-skeletal, mixed, active, frigid Typic 182C Mongaup channery loam, 8 to 15 Loamy-skeletal, mixed, active, frigid Typic 201A Lima loam, 0 to 3 Fine-loamy, mixed, semiactive, mesic Oxyaquic Hapludalfs 201B Lima loam, 3 to 8 Fine-loamy, mixed, semiactive, mesic Oxyaquic Hapludalfs 201C Lima loam, 8 to 15 Fine-loamy, mixed, semiactive, mesic Oxyaquic Hapludalfs 204A Lima loam, 0 to 3, lower clay surface Fine-loamy, mixed, semiactive, mesic Oxyaquic Hapludalfs 204B Lima loam, 3 to 8, lower clay surface Fine-loamy, mixed, semiactive, mesic Oxyaquic Hapludalfs 210A Phelps gravelly silt loam, 0 to 3 Fine-loamy over sandy or sandy-skeletal, mixed, active, mesic Glossaquic Hapludalfs 210B Phelps gravelly silt loam, 3 to 8 Fine-loamy over sandy or sandy-skeletal, mixed, active, mesic Glossaquic Hapludalfs 212A Nuhi silt loam, 0 to 3 Fine-loamy, mixed, active, mesic Glossaquic Hapludalfs 240B Aurora-Angola silt loams, 3 to 8 Fine-loamy, mixed, active, mesic Glossaquic Hapludalfs C Aurora-Angola silt loams, 8 to 15 Fine-loamy, mixed, active, mesic Glossaquic Hapludalfs D Aurora-Angola silt loams, 15 to 25 Fine-loamy, mixed, active, mesic Glossaquic Hapludalfs B Aurora silt loam, 3 to 8 Fine-loamy, mixed, active, mesic Glossaquic Hapludalfs 241C Aurora silt loam, 8 to 15 Fine-loamy, mixed, active, mesic Glossaquic Hapludalfs D Aurora silt loam, 15 to 25 Fine-loamy, mixed, active, mesic Glossaquic Hapludalfs 255B Cazenovia silt loam, 3 to 8 Fine-loamy, mixed, active, mesic Oxyaquic Hapludalfs 255C Cazenovia silt loam, 8 to 15 Fine-loamy, mixed, active, mesic Oxyaquic Hapludalfs 255D Cazenovia silt loam, 15 to 25 Fine-loamy, mixed, active, mesic Oxyaquic Hapludalfs 260B Cayuga silt loam, 3 to 8 Fine, illitic, mesic Oxyaquic Glossudalfs 260C Cayuga silt loam, 8 to 15 Fine, illitic, mesic Oxyaquic Glossudalfs 260D Cayuga silt loam, 15 to 25 Fine, illitic, mesic Oxyaquic Glossudalfs 304A Kendaia loam, 0 to 3 Fine-loamy, mixed, semiactive, nonacid, mesic Aeric Page 5 of 8

6 304B Kendaia loam, 3 to 8 Fine-loamy, mixed, semiactive, nonacid, mesic Aeric 342A Angola silt loam, 0 to 3 Fine-loamy, mixed, active, mesic Aeric Endoaqualfs 356A Ovid silt loam, 0 to 3 Fine-loamy, mixed, active, mesic Aeric Endoaqualfs 356B Ovid silt loam, 3 to 8 Fine-loamy, mixed, active, mesic Aeric Endoaqualfs 357B Ovid silty clay loam, 3 to 8 Fine-loamy, mixed, active, mesic Aeric Endoaqualfs 357C Ovid silty clay loam, 8 to 15 Fine-loamy, mixed, active, mesic Aeric Endoaqualfs 400A Udorthents, loamy, 0 to 3 Udorthents D Udorthents, refuse substratum. 0 to 25 Udorthents 100 PG Pits, gravel and sand 75 PQ Pits, quarry 80 W Water 100 Page 6 of 8

7 Options Attribute Name: This rating presents the taxonomic classification based on Soil Taxonomy. The system of soil classification used by the National Cooperative Soil Survey has six categories (Soil Survey Staff, 1999 and 2003). Beginning with the broadest, these categories are the order, suborder, great group, subgroup, family, and series. Classification is based on soil properties observed in the field or inferred from those observations or from laboratory measurements. This table shows the classification of the soils in the survey area. The categories are defined in the following paragraphs. ORDER. Twelve soil orders are recognized. The differences among orders reflect the dominant soil-forming processes and the degree of soil formation. Each order is identified by a word ending in sol. An example is Alfisols. SUBORDER. Each order is divided into suborders primarily on the basis of properties that influence soil genesis and are important to plant growth or properties that reflect the most important variables within the orders. The last syllable in the name of a suborder indicates the order. An example is Udalfs (Ud, meaning humid, plus alfs, from Alfisols). GREAT GROUP. Each suborder is divided into great groups on the basis of close similarities in kind, arrangement, and degree of development of pedogenic horizons; soil moisture and temperature regimes; type of saturation; and base status. Each great group is identified by the name of a suborder and by a prefix that indicates a property of the soil. An example is Hapludalfs (Hapl, meaning minimal horizonation, plus udalfs, the suborder of the Alfisols that has a udic moisture regime). SUBGROUP. Each great group has a typic subgroup. Other subgroups are intergrades or extragrades. The typic subgroup is the central concept of the great group; it is not necessarily the most extensive. Intergrades are transitions to other orders, suborders, or great groups. Extragrades have some properties that are not representative of the great group but do not indicate transitions to any other taxonomic class. Each subgroup is identified by one or more adjectives preceding the name of the great group. The adjective Typic identifies the subgroup that typifies the great group. An example is Typic Hapludalfs. FAMILY. Families are established within a subgroup on the basis of physical and chemical properties and other characteristics that affect management. Generally, the properties are those of horizons below plow depth where there is much biological activity. Among the properties and characteristics considered are particle-size class, mineralogy class, cation-exchange activity class, soil temperature regime, soil depth, and reaction class. A family name consists of the name of a subgroup preceded by terms that indicate soil properties. An example is fine-loamy, mixed, active, mesic Typic Hapludalfs. SERIES. The series consists of soils within a family that have horizons similar in color, texture, structure, reaction, consistence, mineral and chemical composition, and arrangement in the profile. References: Soil Survey Staff Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service. U.S. Department of Agriculture Handbook 436. Soil Survey Staff Keys to soil taxonomy. 10th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. (The soils in a given survey area may have been classified according to earlier editions of this publication.) Aggregation is the process by which a set of component attribute values is reduced to a single value to represent the map unit as a whole. A map unit is typically composed of one or more "components". A component is either some type of soil or some nonsoil entity, e.g., rock outcrop. The components in the map unit name represent the major soils within a map unit delineation. Minor components make up the balance of the map unit. Great differences in soil properties can occur between map unit components and within short distances. Minor components may be very different from the major components. Such differences could significantly affect use and management of the map unit. Minor components may or may not be documented in the database. The results of aggregation do not reflect the presence or absence of limitations of the components which are not listed in the database. An on-site investigation is required to identify the location of individual map unit components. For each of a map unit's components, a corresponding composition is recorded. A composition of 60 indicates that the corresponding component typically makes up approximately 60% of the map unit. Percent composition is a critical factor in some, but not all, aggregation methods. For the attribute being aggregated, the first step of the aggregation process is to derive one attribute value for each of a map unit's components. From this set of component attributes, the next step of the aggregation process derives a single value that represents the map unit as a whole. Once a single value for each map unit is derived, a thematic map for soil map units can be generated. Aggregation must be done because, on any soil map, map units are delineated but components are not. The aggregation method "Dominant Condition" first groups like attribute values for the components in a map unit. For each group, composition is set to the sum of the composition of all components participating in that group. These groups now represent "conditions" rather than components. The attribute value associated with the group with the highest cumulative composition is returned. If more than one group shares the highest cumulative composition, the corresponding "tie-break" rule determines which value should be returned. The "tie-break" rule indicates whether the lower or higher group value should be returned in the case of a composition tie. The result returned by this aggregation method represents the dominant Page 7 of 8

8 returned in the case of a composition tie. The result returned by this aggregation method represents the dominant condition throughout the map unit only when no tie has occurred. The tie-break rule indicates which value should be selected from a set of multiple candidate values, or which value should be selected in the event of a composition tie. Page 8 of 8