Gould wuxuu soo jeedinayaa in kala duwanaanta aan caadiga ahayn ee lafaha ay muujineyso ay muujineyso in qaababka nolosha ee waqtigaas ay aad uga kala duwan yihiin qaabka jirka marka loo eego kuwa maanta nool, iyo in fara badan oo ka mid ah hiddooyinka gaarka ah ay ahaayeen tijaabooyin horumarineed oo bakhtiyay. Fasiraadda Gould ee kala duwanaanta noolaha Cambrian waxay si weyn ugu tiirsanayd dib-u-fasiraadda Simon Conway Morris ee daabacaadaha asalka ah ee Charles Walcott. Si kastaba ha noqotee, Conway Morris wuxuu si adag uga soo horjeestay natiijooyinka Gould, isagoo ku dooday in ku dhowaad dhammaan noolaha Cambrian loo kala saari karo noocyada maanta jira.
Dhagxaanta dhagaxyada ee Burgess Shale