Developing Marine Ecosystems (September 17 & 21)

It is an unusual week for us. We have class on Monday, no class on Wednesday, a review session on Thursday (3:30 – 4:30 pm, Scovel 205). Then your first lecture examination is on Friday. For preparation, I’m giving you a copy of the Fall 2017 student HOL test #1 answers as a pdf. I highly recommend reading it through. The student answers are not necessarily the best, but they were good enough to receive full credit. Also note that there are always topics we covered in the past that we may not have done this semester, and vice versa. You will be tested over only what we have completed in class through Monday, September 17. Test seating: Students with last names starting with A through L in Room 205 (our regular room); M-Z in Room 216 (across the lobby). Test doors open at 7:50 a.m.; all tests due at 8:50 a.m.

Our topic on Monday is the rise of animal life and the early development of marine communities. A good place to start is with the Wikipedia page on the Ediacaran Biota. The Wikipedia pages on all these topics are good and authoritative. Another example is the Cambrian article.

We will spend time on the rise of skeleton-bearing invertebrates in the Cambrian. I hope you enjoy the Burgess Shale (this is the Smithsonian’s main page on it), found in the Middle Cambrian. Here is the Smithsonian’s Burgess Shale reconstructed images page. (I was fortunate to visit the Burgess Shale quarries in British Columbia.) This virtual submarine website from the Royal Ontario Museum has great animated images of the Burgess Shale fauna. A new site of Burgess Shale-type fossils in Kootenay National Park in Canada was announced recently. It may soon rival the original for number and diversity of soft-bodied fossils.

You may enjoy this blog post from the superlative science writer Carl Zimmer on the Cambrian animals. (The illustrations by Quade Paul are stunning.) Zimmer also has a New York Times article on new ideas about “Evolution’s Big Bang” in the Cambrian.

Anomalocaridid “arm” from the Burgess Shale, Walcott Quarry, British Columbia, Canada.

Geology in the News –

Dr. Rick Lehtinen recently named a new frog species after our treasured College of Wooster. This is an honor for Wooster and an accomplishment for Dr. Lehtinen. Guibemantis woosteri is a cute little guy who lives in Madagascar.

Here’s a beautiful map showing streams and rivers of the United States. The watersheds are in separate colors.

Wish we could spend more time with the Kingdom Fungi. Here’s a nice modern summary of their diversity and utility.

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