Puzzle Description:

Trilobites, marine fossils thought to be from the Cambrian period when there was an explosion of marine life. On the left is a Bristolia. On the right is a Lichida. Trilobites multiplied profusely and crawled on the bottom of the shallow ocean floor. The Cambrian explosion was the relatively rapid appearance, over a period of many million years, of most major groups of complex animals around 530 million years ago, accompanied by a major diversification of organisms.

#1: Teresa K (fasstar) on May 29, 2010 [HINT]

This one takes a little work. You don't need it, but I found that some simple edge logic on the right and on the top helped get this one going.

Trilobites were an Arthropod that lived 505 to 455 million years ago, during the Paleozic. They get their name from their exoskeleton, divided into three lobes.

Here are photos of the two trilobites depicted in my puzzle:

http://www.backtothepast.com.mx/simpleviewer/images/bristolia_fragilis.jpg

http://www.trilobites.info/Chlustinia_keyserlingi_ttmx79c.jpg

and an entire gallery you can explore:

http://www.trilobites.info/trilobite.htm

They lasted for 250 million years before extinction. Check out this timeline that compares their lineage to other life forms:

http://evolution.berkeley.edu/evolibrary/images/trilobite_timeline.gif

Trilobites died out during the Cambrian mass extinction, when a majority of life forms became extinct.

Very interesting puzzle Teresa and more than a bit tricky!

I love the combination biology lessons/puzzles. That tricky Lichida on the right nearly did me in, though, with all of those alternating reds and blacks!

This was very unusual and quite, quite fun to solve.

Thanks, BlackCat.

Loved this one! Interesting and clever.

nice to solve

Goto next topic

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