[SOLVED] Cannot mount ext4 partition from USB drive

I am running Ubuntu 12.04 under Oracle VirtualBox version 4.3.12, underlying OS is Windows 7, SP1.
I am trying to mount my old Fedora 19 partition, which is located in my external hard drive, which I have plugged in to a USB port in my laptop, where I'm running Windows 7.
Here's a transcript from my terminal:

user@laptop-VirtualBox:/media$ sudo mount -v -t ext4 /dev/sdb6 /media/fedora19
[sudo] password for zac:
mount: wrong fs type, bad option, bad superblock on /dev/sdb6,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so

user@laptop-VirtualBox:/media$

if I try to have mount guess the fs type:

user@laptop-VirtualBox:/media$ sudo mount /dev/sdb6 /media/fedora19
mount: unknown filesystem type 'LVM2_member'
user@laptop-VirtualBox:/media$

I have researched this in the forums and Google'd it and I have not found anything similar to it; which is why I'm asking the question here.

Any guidance will be most appreciated!

happyraver1958-9