Triple

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Phrase: St. Louis Limestone | Statement: [Harrodsburg Limestone, underlies, St. Louis Limestone]

Target entity: St. Louis Limestone
Context triple: [Harrodsburg Limestone, underlies, St. Louis Limestone]

• A. Salem Limestone
  Salem Limestone is a Mississippian-age sedimentary rock formation widely quarried in the U.S. Midwest, especially Indiana, and prized as a high-quality building stone.
• B. Harrodsburg Limestone
  Harrodsburg Limestone is a Mississippian-age carbonate rock formation in the central United States, notable for its fossil-rich marine deposits and use as a building stone.
• C. Anston limestone
  Anston limestone is a durable, fine-grained building stone from Anston in South Yorkshire, England, historically quarried for major 19th-century architectural projects.
• D. Mitchell Limestone
  Mitchell Limestone is a geologic limestone formation known from the Midwestern United States, recognized for its stratigraphic position and fossil-bearing carbonate rocks.
• E. Tura limestone
  Tura limestone is a fine white Egyptian limestone historically prized for its high quality and used as the outer casing stone for major monuments such as the Great Pyramid of Giza.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"

Entity: St. Louis Limestone
Triple: [Harrodsburg Limestone, underlies, St. Louis Limestone]

St. Louis Limestone is a Mississippian-age carbonate rock formation in the central United States, notable for its thick, fossil-bearing marine limestones that are important in regional stratigraphy and hydrocarbon exploration.

Target entity: St. Louis Limestone
Target entity description: St. Louis Limestone is a Mississippian-age carbonate rock formation in the central United States, notable for its thick, fossil-bearing marine limestones that are important in regional stratigraphy and hydrocarbon exploration.

• A. Salem Limestone
  Salem Limestone is a Mississippian-age sedimentary rock formation widely quarried in the U.S. Midwest, especially Indiana, and prized as a high-quality building stone.
• B. Harrodsburg Limestone
  Harrodsburg Limestone is a Mississippian-age carbonate rock formation in the central United States, notable for its fossil-rich marine deposits and use as a building stone.
• C. Anston limestone
  Anston limestone is a durable, fine-grained building stone from Anston in South Yorkshire, England, historically quarried for major 19th-century architectural projects.
• D. Mitchell Limestone
  Mitchell Limestone is a geologic limestone formation known from the Midwestern United States, recognized for its stratigraphic position and fossil-bearing carbonate rocks.
• E. Tura limestone
  Tura limestone is a fine white Egyptian limestone historically prized for its high quality and used as the outer casing stone for major monuments such as the Great Pyramid of Giza.
• F. None of above. chosen