[Rockhounds] Iridium in undersea crater confirms asteroid wiped out the dinosaurs

[gbrown at catspaw-minerals.com]

I graduated in '72 with a degree in geological engineering.  If I remember correctly (THAT is a fun issue after a half century!) the idea of continental drift was barely mentioned.  Did you know that as late as the 1950's people were still debating the cause of the big crater in NE Arizona...you know...METEOR crater?

GcB

-----Original Message-----
From: Rockhounds <rockhounds-bounces at rockhounds.drizzle.com> On Behalf Of Doug Bank
Sent: Wednesday, February 24, 2021 5:03 PM
To: Rockhounds at drizzle.com: A mailing list for rock and gem collectors <rockhounds at rockhounds.drizzle.com>
Subject: Re: [Rockhounds] Iridium in undersea crater confirms asteroid wiped out the dinosaurs

I have found geology texts from the 1970s that still did not accept plate tectonics! People are stubborn. 
.