There are many granulometric scales in use, but the Udden-Wentworth scale (commonly known as the Wentworth scale) is the most widely used in geology.

This new edition is a revision of the previously published Geological Society of America (GSA) Rock Color Chart prepared by the Rock Color Tables Committee. Included are 115 color chips with Munsell's numerical designation to identify the rock...

Protractor W-44 Ruler Metric Scale 1: 250

Universal Pattern, Yellow PolyDura Cover, 50 Sheets (100 Pages). Waterproof paper: 100 pages / 50 sheets per pocket notepad. All-weather paper doesn't get wet when wet and repels water, sweat, grease, mud and will even survive accidental...

Get the same rite in the rain quality with replacement 4-3 / 4 "x 7-1 / 2" blades. Fits No. 200 and No. 210 ring binders. Sold in packs of 100 sheets. size - 4-3 / 4 '' x 7-1 / 2 ''

Ideal for field work performed by professionals in geology and mining. It incorporates sixteen pages of geological information, including: grain size scales, soil classification, geological map symbols, rock classification diagrams, geological...

These are the loose sheets that professionals use. Special 6-groove round punches fit Rite in No. 200 (43455), No. 9200 (49440), and No. 9200T (49441) Rain Ring Binders. 4-5 / 8˝ x 7˝ sheet size. Pack of 100 sheets.

While a pencil works great with rite in the rain products, sometimes a pen is needed. Don't worry about running out of ink, refills will accommodate all models of rite in the rain pens.