I took it to my cousin and pointed out that a cephalon was partially visible and maybe a whole trilobite was there. So he sandblasted the rock for about 20 minutes and what a surprise. There were sections of three Flexicalymene trilobites there. The largest one is about 2 cm long.
This is a work in progress. More matrix needs to be removed to see if another cephalon exists. Notice the white marks on the rock made by the engraver tool.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjejzI0ZHEk_Ss8yqJ72PMHwybk1bnJesHyICaPH39cXO9Kbs20yFdTOQHpYvk6OyZ02FBzjrIV2-uRpJzMTB-D0DVgpjVZjtKTm6MoJAxpQzyO5NBMgkDzL_LGl0eYR7khXDjvSa93MYhE/s400/extracted-flexicalymene-with-ruler.jpg)