[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"blog-\u002Fblog\u002Foklahoma-plss-guide-indian-meridian-anadarko-basin-and-converting-legal-descriptions-for-og-workflows":3},{"id":4,"title":5,"body":6,"cover":206,"date":207,"description":208,"draft":209,"extension":210,"meta":211,"navigation":230,"path":231,"seo":232,"stem":233,"tags":234,"__hash__":243},"blog\u002Fblog\u002Foklahoma-plss-guide-indian-meridian-anadarko-basin-and-converting-legal-descriptions-for-og-workflows.md","Oklahoma PLSS Guide: Indian Meridian, Anadarko Basin, and Converting Legal Descriptions for O&G Workflows",{"type":7,"value":8,"toc":196},"minimark",[9,13,18,21,33,46,50,53,81,88,92,95,118,126,130,133,147,150,154,157,170,178,182,185],[10,11,12],"p",{},"A landman working a mid-continent portfolio reads a stack of lease exhibits from Oklahoma, Kansas, and Colorado in one sitting. On the page, the Oklahoma descriptions and the Colorado descriptions look almost identical: a township, a range, a section, an aliquot part. What separates them is the principal meridian, and that single field decides where the parcel actually sits. Oklahoma is surveyed from the Indian Meridian, not the 6th Principal Meridian that covers Kansas and eastern Colorado. Read an Oklahoma PLSS Indian Meridian legal description under the wrong meridian and the same Township and Range points at a section in another state. This guide covers how Oklahoma's grid is organized, where the Anadarko and Arkoma basins sit in PLSS terms, and how to convert those descriptions to coordinates for a GIS or data workflow.",[14,15,17],"h2",{"id":16},"the-indian-meridian-oklahomas-survey-origin","The Indian Meridian: Oklahoma's survey origin",[10,19,20],{},"The Indian Meridian is the principal meridian for almost all of Oklahoma. Its initial point sits in south-central Oklahoma, near Fort Arbuckle in present-day Murray County, and every township and range in the state is counted from that origin: townships north or south of the baseline, ranges east or west of the meridian line.",[10,22,23,24,28,29,32],{},"Two neighbors use different origins. Kansas and the eastern plains of Colorado are surveyed from the ",[25,26,27],"strong",{},"6th Principal Meridian",", whose initial point is on the Kansas-Nebraska line. New Mexico, to the southwest, uses the ",[25,30,31],{},"New Mexico Principal Meridian",", with its own initial point south of Santa Fe. A description of T16N R8W means one location under the Indian Meridian and an entirely different location under the 6th Principal Meridian. The meridian is not a formatting detail. It is part of the address.",[10,34,35,36,39,40,45],{},"One in-state exception matters for oil and gas work. The Oklahoma Panhandle (Cimarron, Texas, and Beaver counties) is surveyed from the ",[25,37,38],{},"Cimarron Meridian",", not the Indian Meridian. A well table that reaches from the Anadarko Basin into the Panhandle mixes two meridians, and each description has to carry its own. The ",[41,42,44],"a",{"href":43},"\u002Flearn\u002Fmeridians\u002Findian-principal-meridian","Indian Meridian reference"," covers the initial point and coverage in more detail.",[14,47,49],{"id":48},"reading-an-oklahoma-plss-legal-description","Reading an Oklahoma PLSS legal description",[10,51,52],{},"An Oklahoma legal description stacks four elements, read from the largest unit down:",[54,55,56,63,69,75],"ul",{},[57,58,59,62],"li",{},[25,60,61],{},"Township",": distance north or south of the Indian Meridian baseline, written T16N (Township 16 North).",[57,64,65,68],{},[25,66,67],{},"Range",": distance east or west of the meridian line, written R8W (Range 8 West).",[57,70,71,74],{},[25,72,73],{},"Section",": one of the 36 square-mile sections in that township, numbered 1 to 36.",[57,76,77,80],{},[25,78,79],{},"Aliquot part",": the quarter, quarter-quarter, or finer division inside the section.",[10,82,83,84,87],{},"Put together, ",[25,85,86],{},"T16N R8W Sec 14 SW¼NE¼, Indian Meridian"," describes a 40-acre parcel (the southwest quarter of the northeast quarter) inside Section 14, in Kingfisher County's STACK play. That full string, meridian included, is what belongs on a permit exhibit, a lease, or a well-master row. Drop the meridian and the description is incomplete.",[14,89,91],{"id":90},"the-anadarko-basin-by-legal-description","The Anadarko Basin by legal description",[10,93,94],{},"The Anadarko Basin covers western and west-central Oklahoma and reaches into the Texas Panhandle. Its active PLSS footprint runs through counties like Woodward, Blaine, Caddo, Grady, and Stephens, and includes the Woodford Shale and the Granite Wash. The two informal plays most operators name, the STACK (Sooner Trend, Anadarko, Canadian, Kingfisher) and the SCOOP (South Central Oklahoma Oil Province), both sit inside this basin:",[54,96,97,104,111],{},[57,98,99,100,103],{},"A STACK description such as ",[25,101,102],{},"T17N R11W Sec 20 NE¼, Indian Meridian"," places you in the Blaine County stretch of the play.",[57,105,106,107,110],{},"A SCOOP description such as ",[25,108,109],{},"T7N R6W Sec 22 SW¼, Indian Meridian"," falls in Grady County to the south.",[57,112,113,114,117],{},"A deeper Anadarko example in Caddo County reads ",[25,115,116],{},"T9N R11W Sec 18 NW¼NE¼, Indian Meridian",".",[10,119,120,121,125],{},"Every one of these carries the Indian Meridian, and every range runs west of it. Confirm any western-Oklahoma description in the ",[41,122,124],{"href":123},"\u002Foklahoma-plss-converter","Oklahoma PLSS converter"," before it goes on a filing.",[14,127,129],{"id":128},"the-arkoma-basin-by-legal-description","The Arkoma Basin by legal description",[10,131,132],{},"The Arkoma Basin sits on the other side of the state, in eastern Oklahoma, and continues into western Arkansas. It is a gas-prone basin, and its Oklahoma counties include Coal, Pittsburg, and LeFlore. Because ranges here are counted east of the Indian Meridian, Arkoma descriptions carry an E range where Anadarko descriptions carry a W:",[54,134,135,141],{},[57,136,137,138,117],{},"A Pittsburg County description reads ",[25,139,140],{},"T5N R15E Sec 20 SE¼, Indian Meridian",[57,142,143,144,117],{},"A LeFlore County description near the Arkansas line reads ",[25,145,146],{},"T6N R25E Sec 8 NW¼, Indian Meridian",[10,148,149],{},"The meridian is the same across the whole state, so a portfolio that spans both basins never changes meridian inside Oklahoma. What changes is the range direction, and a transposed E for W sends the parcel to the opposite side of the state.",[14,151,153],{"id":152},"converting-oklahoma-descriptions-to-coordinates","Converting Oklahoma descriptions to coordinates",[10,155,156],{},"A GIS layer, a mapping tool, or a data warehouse needs latitude and longitude, not a survey grid reference. Township America resolves an Oklahoma PLSS description to coordinates against official BLM survey data, across all 30 PLSS states and all 37 principal meridians, down to the 1\u002F64 aliquot part (about 10 acres). It returns the actual BLM survey boundary of the parcel as a GeoJSON polygon, not a centroid estimated from a grid formula, so the parcel drops into QGIS, ArcGIS, or a web map as a real boundary.",[10,158,159,160,164,165,169],{},"For a single well, the converter answers by eye. For a full well list, batch conversion (on the Business plan, $40 per user per month) takes a CSV or Excel upload and returns thousands of coordinates in one pass, with structured exports in CSV, KML, Shapefile, GeoJSON, and DXF. Teams that geocode inside their own pipeline can call the same conversion through the ",[41,161,163],{"href":162},"\u002Fapi","API",", which offers single, batch, autocomplete, and map-tile endpoints along with Python and TypeScript SDKs and an MCP server for AI agents. The ",[41,166,168],{"href":167},"\u002Fguides\u002Fbatch-conversion","batch conversion guide"," walks through the upload path end to end.",[10,171,172,173,177],{},"To layer well and lease context onto those Oklahoma sections, the Energy pack ($150 per month on Pro or Business) adds producing-state wells (Oklahoma included), BLM oil and gas leases, ONRR royalty totals, HIFLD pipelines, split-estate detection, and FracFocus disclosures on top of each conversion. See ",[41,174,176],{"href":175},"\u002Fpricing","pricing"," for how the packs stack.",[14,179,181],{"id":180},"the-most-common-mid-continent-error","The most common mid-continent error",[10,183,184],{},"The mistake that shows up most often on multi-state work is applying the 6th Principal Meridian to an Oklahoma description out of habit. A landman who spends the morning in Kansas and Colorado leases, both on the 6th Principal Meridian, carries that assumption into an Oklahoma tract and reads T16N R8W as a 6th Principal Meridian location. The Township and Range are valid under both systems, so nothing looks wrong: the description resolves, just to the wrong state. The only defense is to treat the meridian as a required field on every description and to convert against a source that honors it. Oklahoma work is the Indian Meridian, the Panhandle is the Cimarron Meridian, and neither is the 6th.",[10,186,187,188,190,191,195],{},"Oklahoma's grid is consistent once the meridian is fixed: one Indian Meridian across the producing basins, the Cimarron Meridian in the Panhandle, and range direction as the field that flips between Anadarko and Arkoma work. Confirm each description in the ",[41,189,124],{"href":123}," before it reaches a permit or a map, and run a full well list through batch conversion when the table is more than a handful of rows. The ",[41,192,194],{"href":193},"\u002Findustries\u002Foil-and-gas","oil and gas workflows"," page shows how the conversion fits the rest of a land-data pipeline.",{"title":197,"searchDepth":198,"depth":198,"links":199},"",2,[200,201,202,203,204,205],{"id":16,"depth":198,"text":17},{"id":48,"depth":198,"text":49},{"id":90,"depth":198,"text":91},{"id":128,"depth":198,"text":129},{"id":152,"depth":198,"text":153},{"id":180,"depth":198,"text":181},null,"2026-07-29T10:00:00Z","Read Oklahoma PLSS Indian Meridian legal descriptions: how the meridian differs from the 6th Principal Meridian, plus Anadarko and Arkoma basin O&G workflows.",false,"md",{"author":212,"category":213,"faqs":214},"Township America","industry",[215,218,221,224,227],{"question":216,"answer":217},"Which principal meridian covers Oklahoma PLSS legal descriptions?","Almost all of Oklahoma is surveyed from the Indian Meridian. Its initial point sits in south-central Oklahoma, near Fort Arbuckle in present-day Murray County, and every township and range in the state is counted from that origin. The one exception is the Oklahoma Panhandle: Cimarron, Texas, and Beaver counties are surveyed from the Cimarron Meridian. Oklahoma is never the 6th Principal Meridian, which covers Kansas and eastern Colorado.",{"question":219,"answer":220},"How is the Anadarko Basin described in PLSS terms?","The Anadarko Basin covers western and west-central Oklahoma and reaches into the Texas Panhandle. Its active PLSS footprint runs through counties like Woodward, Blaine, Caddo, Grady, and Stephens, and includes the Woodford Shale and the Granite Wash. The STACK and SCOOP plays both sit inside it. Ranges are counted west of the Indian Meridian, so a STACK description reads like T17N R11W Sec 20 NE quarter, Indian Meridian in Blaine County.",{"question":222,"answer":223},"How do Arkoma Basin legal descriptions differ from Anadarko descriptions?","The Arkoma Basin sits in eastern Oklahoma and continues into western Arkansas. It is gas-prone, and its Oklahoma counties include Coal, Pittsburg, and LeFlore. The meridian is still the Indian Meridian, so it does not change within the state. What changes is the range direction: Arkoma descriptions carry an E range (east of the meridian) where Anadarko descriptions carry a W. A transposed E for W sends the parcel to the opposite side of Oklahoma.",{"question":225,"answer":226},"Why does applying the 6th Principal Meridian to an Oklahoma description cause errors?","The 6th Principal Meridian covers Kansas and eastern Colorado, and a Township and Range like T16N R8W is valid under both the 6th Principal Meridian and the Indian Meridian. Read the Oklahoma description under the 6th and it still resolves, just to a location in another state. Nothing looks wrong on the page, which is why the meridian has to be treated as a required part of every description.",{"question":228,"answer":229},"Can I batch convert a whole Oklahoma well list to coordinates?","Yes. Batch conversion on the Business plan ($40 per user per month) takes a CSV or Excel upload of PLSS legal descriptions and returns thousands of coordinates in one pass, with structured exports in CSV, KML, Shapefile, GeoJSON, and DXF. Teams that geocode inside their own pipeline can call the same conversion through the API batch endpoint. Both carry each description's meridian through the conversion, so a table that mixes the Indian Meridian with the Cimarron Meridian does not need pre-sorting.",true,"\u002Fblog\u002Foklahoma-plss-guide-indian-meridian-anadarko-basin-and-converting-legal-descriptions-for-og-workflows",{"title":5,"description":208},"blog\u002Foklahoma-plss-guide-indian-meridian-anadarko-basin-and-converting-legal-descriptions-for-og-workflows",[235,236,237,238,239,240,241,242],"PLSS","Oklahoma","Indian Meridian","Anadarko Basin","Arkoma Basin","oil and gas","landman","legal description","NB5o7r69J8DsChsqbQQT3O43d9Eym_CEDt5svKRDndU"]