404. That’s an error.

The requested URL /bookmarks/mark?op=add&title=Spectrogram+Displays%3A+Mammoth+Deep+Hole++%28MDH1+DP1+NC+--%29+Jan+28%2C+2013+06%3A00%26ndash%3B08%3A00&annotation=&nui=1&service=bookmarks&bkmk=http%3A%2F%2Fearthquake.usgs.gov%2Fmonitoring%2Fspectrograms%2F2hr%2F77%2F20130128%2F06%2F was not found on this server. That’s all we know.