A field marker for attachment to a farm implement to form agroove in the ground for guiding a farmer as the implement is towed ordriven across a field includes an inner wing section pivotallyconnected to a lateral end of the implement and an outer arm sectionpivotally connected to the distal end of the wing section. The wingsection may be pivoted hydraulically from a working position extendingoutwardly from the implement to a stowage position parallel to theimplement. The arm section may be pivoted hydraulically generallyvertically relative to the wing section through an angle of about 190°between its stowage position and its working position. The armsection is provided with a spring-loaded breakaway mechanism thatpermits an outer arm portion of the arm section to pivot rearwardly ofan inner arm portion of the arm section should the arm sectionencounter an immovable obstruction. The breakaway mechanism can beeasily and quickly reset after activation without having to replaceany parts.
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