About 14' wide.
Beginning from center of seaglass and moving outward, next area is Earth crust slurry melted from an area of the Mid-Atlantic Ridge called the Kane Fracture Zone. Outside that is from the first sediment core that confirmed the iridium anomaly dated as asteroid dust from about 65 million years ago. The dark volcanic sediment is from a Galapagos dredge, filled with chunks that moved over the green matte glaze on front and back . . . interesting 'reading'.