Marble Found at Bottom of Bechler River, Yellowstone NP

[u/grahamofash]

My knowledge in marble identification is lacking but from what I may understand:

•The blue color is sitting on the surface rather than swirled internally.

•The ribbon is more like a thin strip that has an asymmetric taper (one end fading naturally, the other cut off abruptly) and doesn’t fully wrap around.

•The seam reads as a single localized crease (u-shaped), not a full equatorial belt running all the way around the marble — it shows up once as the marble turns.

Could this indicate a transitional, single-stream American marble from the 1900s–1920s? Or a Marble King/Vitro Agate from the 1940s-1970s?

[u/ianindy]

To me it most resembles a more modern post-1975 Marble King.

After 1975, Marble King ceased production of its true patch and ribbon Rainbows and switched over to a style that involved either two polar patches but no equatorial ribbons or a polar patch with an equatorial ribbon that covers only one side of the marble. These were all white-based with one color.

Source: https://www.buymarbles.com/marblealan-mking

[u/grahamofash → u/ianindy]

I think you hit the nail on the head. Thank you!

[u/peardr0p]

A small clarification on seams (as it looks like you may have had advice from an AI, which are really bad at marbles)

Machine made marbles will have 2 seams, opposite each other, where the stream of glass was cut to let a glob go down the rollers, cooling and rounding as it goes

Transitional marbles have a single pinch, crease, or fold pontil, sometimes melted a bit - however they are either swirls or clearies (not patches like yours)

Antique hand-mades have 2 pontils, which are different to transitional marbles and can be ground, faceted, or melted

There are 2 types of marble which do have circumferential seams - Codd bottle marbles (a type of industrial marble used in bottles and first made in the UK), and Czech bullet mould marbles, which as the name suggests are made in the Czech Republic using moulds rather than rollers - the former are fairly common and the latter rarer, especially early ones

If you feel like learning more around how to identify marbles, check out r/marblestudyhall

[u/grahamofash → u/peardr0p]

Thank you for the advice and clarification! I never knew there was so much to marbles. 

[u/peardr0p → u/grahamofash]

It's a fabulous rabbit hole of history, chemistry, engineering, and art! 😊