凌家灘玉版

前石器時代

长11.4厘米、宽8.3厘米、厚1厘米

玉龟长9.4厘米、高4.6厘米、宽7.5厘米

合成圖

有学者分析：玉版最中心的八角纹有可能代表太阳，两圆之间的八个“圭”形纹代表八个方位，玉版四角的“圭”形纹表示四维。四维和八方，即《史记·龟策列传》中记载的“四维已定，八卦相望”。学者由此推断：凌家滩遗址的玉版，其纹饰有可能是表示四时历法的原始“八卦图”。

央博

玉版正面呈长方形，两短边略内弧，背面略内凹。两短边各钻5个圆孔，一长边钻9个圆孔，另一长边在两端各钻2个圆孔。中部刻有一小圆圈，圈内刻八角星纹。圈外刻一大圆，两圆之间以直线平分八等份，每等份中刻一圭形纹饰，在大圆外沿对着长方形玉版的四角各刻一圭形纹饰。这件玉版或与“元龟衔符”的八卦有关。

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