Announcement

Collapse
No announcement yet.

Strange wear and classification question

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Strange wear and classification question

    I posted this piece as part of a group yesterday.

    I'm intrigued by the unusual wear or pocking on one surface.

    Also not sure if it's a projectile point or what?

    Any thoughts?

    Click image for larger version

Name:	IMG_9536.jpg
Views:	1
Size:	217.2 KB
ID:	377679

    Click image for larger version

Name:	IMG_9529.jpg
Views:	1
Size:	182.5 KB
ID:	377680

    Click image for larger version

Name:	IMG_9530.jpg
Views:	1
Size:	160.9 KB
ID:	377681

  • #2
    That looks like slag to me. 🤔
    Bruce
    In life there are losers and finders. Which one are you?

    Comment


    • tomf
      tomf commented
      Editing a comment
      Definitely obsidian.

      Knapped on both faces but heavily water-worn, like south fork says.

      At first I thought it was a scraper but now think it's a point.

      I've got a lot of water-worn obsidian but have never seen this type of pocking before.

      I guess I wondered if anybody else had?

    • CMD
      CMD commented
      Editing a comment
      Fooled me as well. The vesicles had me thinking slag.

    • tomf
      tomf commented
      Editing a comment
      'vesicles' being the correct term, is new word for me. thanks.

  • #3
    That is the darn kookiest piece I've seen. Maybe the marks came from hitting other rocks? Definitely unique.
    "The education of a man is never completed until he dies." Robert E. Lee

    Comment


    • #4
      Originally posted by Kentucky point View Post
      That is the darn kookiest piece I've seen. Maybe the marks came from hitting other rocks? Definitely unique.
      Kind of looks like gouging but, as you know, obsidian is basically glass and I've never seen glass respond to impacts that way.

      It almost looks like acid corrosion...

      Comment


      • #5
        Here's a close up.

        Click image for larger version

Name:	IMG_9537.jpg
Views:	1
Size:	221.6 KB
ID:	377741

        Comment


        • #6
          Perhaps, they are bubbles that were concealed in the material and then were exposed through wear.

          I think they would be disqualifying, if apparent, when the maker was choosing material.

          Comment


          • #7
            Mystery solved, I think.

            It's fire damage.

            Excerpt from paper named 'Fire Effects on Flaked Stone, Ground Stone, and Other Stone Artifacts'

            "Obsidian is thermally affected at varying temperatures and at differing lengths of exposure to heat. In field and lab fire experiments, obsidian has been reported to fracture, crack, craze, potlid, exfoliate, shatter, oxidize, pit, bubble, bloat, melt, become smudged, discolored, covered with residue, or rendered essentially unrecognizable"

            Good read.

            https://www.fs.fed.us/rm/pubs/rmrs_g..._3_097_111.pdf

            Comment


            • #8
              Wildfire damaged this point, I think.

              It's only bubbled on one side.

              Must have been a hot one though.

              Comment

              Working...
              X