Science. 1963 Jun 14;140(3572):1214. doi: 10.1126/science.140.3572.1214.
Silicified woods, the remains of mid-Tertiary tropical forests, are abundant in the vicinity of Ocú, Panama. Initial identifications reveal plant taxa not previously recorded as fossil woods. The plants identified can be found today in moist forests of tropical America, but not in the savanna-like vegetation now growing at the fossil site.
硅化木在巴拿马奥库地区大量存在,这些硅化木是第三纪中期热带森林的遗迹。初步鉴定显示,这些植物类群以前并未被记录为化石木材。如今,在美洲的潮湿森林中可以找到已鉴定的这些植物,但在化石产地现有的类似热带稀树草原的植被中却找不到。