Changes

===Maturity===

===Maturity===

[[file:core-description_fig2.png|thumb|300px|{{figure number|2}}(a) Comparison chart for sorting and sorting classes. (Modified from <ref name=pt05r125>Pettijohn, F. J., Porter, P. E., Siever, R., 1987, Sand and Sandstone, 2nd. ed.: New York, Springer-Verlag, 553 p.</ref>.) (b) Comparison chart for roundness and sphericity. Modified from Powers.<ref name=pt05r130>Powers, M. C., 1953, A new roundness scale for sedimentary particles: Journal Sedimentary Petrology, v. 23, p. 117–119.</ref>]]

[[file:core-description_fig2.png|thumb|300px|{{figure number|2}}(a) Comparison chart for sorting and sorting classes. (Modified from Pettijohn & Siever.<ref name=pt05r125>Pettijohn, F. J., Porter, P. E., Siever, R., 1987, Sand and Sandstone, 2nd. ed.: New York, Springer-Verlag, 553 p.</ref>) (b) Comparison chart for roundness and sphericity. (Modified from Powers.<ref name=pt05r130>Powers, M. C., 1953, A new roundness scale for sedimentary particles: Journal Sedimentary Petrology, v. 23, p. 117–119.</ref>)]]

Textural maturity of sandstone units is recorded in the next column to the right (“Textural Maturity” in [[:file:core-description_fig1.png|Figure 1]]) and is described following the method outlined by Folk.<ref name=pt05r57>Folk, R. L., 1974, Petrology of Sedimentary Rocks: Austin, TX, Hemphill Publishers, 159 p.</ref> Detrital clay (matrix) content and the sorting and roundness of grains are all considered in the determination of textural maturity. Because it is difficult to estimate the relative abundance of detrital versus authigenic clay without thin section or scanning electron microscope data, care must be taken in making estimates of detrital clay content. Image charts can be used for estimating sorting and roundness ([[:file:core-description_fig2.png|Figure 2]]).

Textural maturity of sandstone units is recorded in the next column to the right (“Textural Maturity” in [[:file:core-description_fig1.png|Figure 1]]) and is described following the method outlined by Folk.<ref name=pt05r57>Folk, R. L., 1974, Petrology of Sedimentary Rocks: Austin, TX, Hemphill Publishers, 159 p.</ref> Detrital clay (matrix) content and the sorting and roundness of grains are all considered in the determination of textural maturity. Because it is difficult to estimate the relative abundance of detrital versus authigenic clay without thin section or scanning electron microscope data, care must be taken in making estimates of detrital clay content. Image charts can be used for estimating sorting and roundness ([[:file:core-description_fig2.png|Figure 2]]).