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...rom rock surface || ''Type I Subclasses''<br>IA:>100md<br>IB: 10–100 md<br>IC: 1–10 md<br>ID: ±0.5–1 md ...64.png|300px|thumb|{{figure number|1}}Examples of rocks with types IA, IB, IC, and ID. From Sneider and King;<ref name=ch09r57 /> courtesy AAPG.]]

...Provenance of North American Phanerozic sandstones in relation to tecton­ ic setting: Geol. Soc. America Bull, v. 94, p. 222-235.</ref> builds two class