fstab - Unable to mount an LVM Hard-drive after upgrade

I imagine this is a basic gotcha ... but I can't see it.
I have a system with 2(physical) harddrives.

The boot system (/dev/sda) was running 10.04 & the second drive (/dev/sdb) was just a mounted filesystem.

I did a clean load of Ubuntu 12.04 overwriting /dev/sda (not an upgrade) & now cannot mount the second drive.
so I do not know what to enter it into the fstab ...
I had expected to use:

/dev/sdb /tera ext4 defaults 0 2

But even manual mounting fails
(I also have tried various "-t" options on the off chance!)

sudo mount -t ext4 /dev/sdb1 /tera

mount: wrong fs type, bad option,
bad superblock on /dev/sdb1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try

dmesg | tail or so

Output from disk queries indicate that it is a Linux LVM & a healthy disk still.

sudo lshw -C disk

   *-disk:0
   description: ATA Disk

   product: WDC WD5000AACS-0
   vendor: Western Digital
   physical id: 0
   bus info: scsi@2:0.0.0
   logical name: /dev/sda
   version: 01.0
   serial: WD-WCASU1401098
   size: 465GiB (500GB)
   capabilities: partitioned partitioned:dos
   configuration: ansiversion=5 signature=00015a55

   *-disk:1
   description: ATA Disk
   product: WDC WD10EADS-00L
   vendor: Western Digital
   physical id: 1
   bus info: scsi@3:0.0.0
   logical name: /dev/sdb
   version: 01.0
   serial: WD-WCAU47836304
   size: 931GiB (1TB)

   capabilities: partitioned partitioned:dos
   configuration: ansiversion=5

sudo fdisk -l

Disk /dev/sda: 500.1 GB, 500106780160 bytes 255 heads, 63
sectors/track, 60801 cylinders, total 976771055 sectors Units =
sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512
bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00015a55

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 972580863 486289408 83 Linux
/dev/sda2 972582910 976769023 2093057 5 Extended
/dev/sda5 972582912 976769023 2093056 82 Linux swap /
Solaris

Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes 255 heads, 63
sectors/track, 121601 cylinders, total 1953525168 sectors Units =

sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512
bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Device Boot Start End Blocks Id System

/dev/sdb1 1 1953525167 976762583+ 8e Linux LVM

LVM doesn't appear to be an option for mount or fstab.

... and here's a Smart data Screenshot from Disk Utility.