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1982年5月副教授邓宝同志,在紫阳瓦房店带领学生毕业实习实测剖面,于相当中志留统底部的灰白色粉砂质泥岩里采到一个巨型弓笔石、(Cyrtograptus grondis n.sp.)。笔石体形态呈圆形、直径超过30公分,具有12个胞管幼枝。主枝始部缠绕用数不清,约旋转0.5周时直径2.8公分,枝宽0.2公分至远部宽度变化不显,保存长度23公分。约在直径3.8公分后几乎变直。
In May 1982, Comrade Deng Bao, an associate professor, led a graduation practice measurement section at Ziyang Wafangdian to collect a giant arches of penicillite in the silty silty mudstone at the bottom of the central part of the Central Zhi-li System (Cyrtograptus grondis n.sp. ). Pen stone morphology was round, more than 30 cm in diameter, with 12 tube young shoots. The main branch at the beginning of winding countless, about 0.5 cm in diameter when the diameter of 2.8 cm, branch width 0.2 cm to the distal width was not significant change, the preservation length of 23 cm. About 3.8 cm in diameter after almost straight.