|Trilobite Megalaspides, Asaphidae |
Trilobites appear in the Cambrian “period”, from nowhere. The evolutionary scientists do not know where trilobites came from. Besides, they do not know where all arthropods (the phylum trilobites belong to) came from anyway:
“As Darwin noted in the Origin of the Species, the abrupt emergence of arthropods in the fossil record during the Cambrian presents a problem for evolutionary biology. There are no obvious simpler or intermediate forms – either living or in the fossil record – that show convincingly how modern arthropods evolved from worm-like ancestors.” 
In other words, arthropods simply emerge in some of the lowest layers of sedimentary rocks (which are layers of mud turned into stone) without any track record. Such a sudden emergence of arthropods is a far cry from the evolution story, but hardly at odds with the global Flood destroying animals created by God.
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 Ordovician, Brown County, Ohio, USA; Staatliches Museum für Naturkunde Karlsruhe, Germany. Автор: H. Zell. License: Creative Commons Attribution-Share Alike 3.0 Unported. Source: https://commons.wikimedia.org/wiki/File:Megalaspides_01.jpg.
 Osorio, Daniel, Jonathan P. Bacon, and Paul M. Whitington. "The Evolution of Arthropod Nervous Systems: Modern Insects and Crustaceans Diverged from an Ancestor over 500 Million Years Ago, but Their Neural Circuitry Retains Many Common Features." American Scientist 85, no. 3 (1997): 244-253. http://www.jstor.org/stable/27856777, accessed on 01/09/2017.