CGT on inheritance

Tax query please. Had inherited some shares last year, e.g. MQG was trading at $75 at time of inheritance but went down and sold at $45. Question is what is the relevant date for tax purposes, i.e. the date at which I inherited and subsequently disposed of at a loss; or the date the person who left me the shares actually bought them, may have been years before with no way of knowing the value at which they were originally purchased?

My tax agent tells me that the relevant date is the date on which I inherited the shares!

Any further clarification please?

 

If the shares were acquired by the deceased before 19 September 1985, the value is that at the date of death. If they were acquired after CGT was introduced the value for your purposes is the cost base of the deceased person