断層や褶曲（しゅうきょく）など地層独自のラインが罫線になったメモブロック。ちょっとしたメッセージを書くための横長サイズ。

A memo pad with lines of geological strata, such as faults and folds (※) depicted on it. These strata lines can be used in the same way as the lines on lined paper when writing on the pages.
memo block “depth of 500 pages.”

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product name：memo block “lines of the stratum.”
design period：2010
manufacture：Marumo Printing Co.Ltd.
material : paper
size : 120×55×15
color : yellow/brown/gray
photo：Ryokan Abe