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在沙七井5436米—5445米的岩屑薄片样中,见有灰岩碎屑,其中一块灰岩中发现三叶虫碎片及一颊刺(见照片1.2),与其伴生的尚有套迭的小壳类软舌螺与少量碎片、海百合(?)、藻屑(?)等。三叶虫碎屑略呈园弧形,长0.11—0.34毫米。在单偏光镜下隐约可见树皮状花纹,正交偏光下呈明显的波状消光;颊刺为横断面,园弧形,直径0.05毫米。
In the sample of debris from 5436 m to 5445 m in Shaqi 7 wells, there are limestone fragments, among which trilobite fragments and cheeks are found in a limestone (see photo 1.2) Small shell soft lingual snails and a small amount of debris, sea lily (?), Algae debris (?) And so on. Trilobite debris was slightly circular arc, long 0.11-0.34 mm. Under the single polarizer, the bark-like pattern can be seen vaguely, and the wave-shaped extinction appeared under the orthogonal polarized light. The buccal thorn is a cross-section, and the arc of the park is 0.05 mm in diameter.