A Different Place

If someone mentions New Zealand, what tidbits of thoughts race through the back of your mind? Mine include ‘hobbit films location’, ‘weird landscape’, ‘two islands’, ‘south Pacific’, and ‘near Australia’. Of course, I don’t often think about New Zealand. It’s very far away, and I’m not likely to get there soon.

A couple weeks ago, I saw a headline about a recent earthquake NZ had. It took my head a couple seconds to realize, “Oh, yeah, it sits on the other side of the ring of fire.” So, just because my curiosity was aroused, I’ve been looking into the geology of NZ.

First of all, yes, New Zealand does have two large islands, but they are surrounded by a bunch of little ones. Islands tend to come in groups, right? Seems like it to me.

The south island is home of the Southern Alps, the tallest some 12,316 ft tall. These steep peaks and the deep fjords on the southwest coast indicate the glaciation that once covered the area. Makes me shiver just thinking of the ice that was once there.

The north island is not as mountainous, but does have volcanoes, which have formed a plateau. That plateau hosts that island’s highest peak (9,177 ft) and the country’s largest lake, which sits in the caldera of one of the world’s most active supervolcanoes. Okay, that’s a little too much heat for roasting marshmallows.

New Zealand is what’s left of Zealandia, a microcontinent (half the size of Australia) that long ago broke off from the super-continent Gondwana, and then slowly submerged. It also straddles the border between the Pacific and Indo-Australian tectonic plates.

The border of these plates is most evident by the Southern Alps, pushed up and contorted by the force of the 2 plates pushing against each other. In other places, the edge of one plate gets pushed beneath the other, producing deep trenches in the ocean, most notably south of NZ, east of North Island, and 2 others further north.

So, NZ has mountains and bays once scoured by glaciers, deep ocean trenches and volcanoes. What about earthquakes? Of course! It sits on a giant fault. In fact, Wikipedia says they experience 150-200 earthquakes every year that can be felt, and almost 14,000 more each year that aren’t felt.

The headline that caught my attention not long ago was about an earthquake in November of this year; a section of seabed that had been raised 6 feet above sea level on a beach. As I researched ‘New Zealand earthquakes,’ I saw another interesting headline, this one about 3 cows that were left stranded on a ‘land island’ after an earthquake. Apparently, that earthquake caused a lot of land to collapse, leaving dots at a higher altitude with sides too steep for the cows to navigate. And possibly some tourists were also trapped on similar ‘land islands’ and had to be rescued.

Just one more way New Zealand is ‘different.’

From Giant Dinosaur to Tiny Hummingbird

So, the theory is that Tyrannosaurus Rex gave birth to today’s birds, right?

Well, not exactly. T Rex was one of the of the theropod dinosaurs. It reached 40 ft in length, stood 12 ft tall at the hips, and weighed around 10 tons. However, other members of the theropod family were of various sizes, all the way down to 1 foot in length and 110 grams (3.9 oz) in weight. And throughout the ages following the T Rex, members of the theropod family grew smaller and smaller, and their skeletons changed four times faster than the skeletons of other dinosaur families. However, the theropods had hollow bones, like birds.

From what I’ve been reading, it isn’t terribly likely that birds evolved directly from T Rex, but they are both considered members of the theropod family. The largest modern theropod is the ostrich, 9 ft tall and up to 320 pounds. The smallest avian is the bee hummingbird, just over 2 inches long and weighing less than 2 grams. Although the theropods have shrunk since the days of T Rex, they continue with a wide range of sizes.

Ever wonder where birds got their feathers? The flying reptiles that nature started with didn’t have any. But the last decade or so, scientists have discovered non-flying dinosaurs that had feathers. How did that happen?

If I understood what I read, the transition began when some scales elongated into a filament. Over time, the filament developed ‘branches’, which eventually became numerous enough to form feathers. Scales and feathers are both made of keratin, and scientists have found that embryonic alligators contain some feather keratin, but that this type of keratin is suppressed in later stages of development in favor of scale keratin. Oh, and by the way, T Rex is more closely related to birds than to alligators.

Actually, lots of dinosaurs had feathers. Perhaps they didn’t grow feathers in order to fly, they grew them as insulation against the cold. And to look pretty to the opposite gender. Only later did the feathers help some glide from tree to tree and feathers started to become part of flying.

Are you up for a story about a T Rex covered in peacock and ostrich feathers?