Hi Maria,
![[TS_welcome]](./images/smilies/TS_welcome.png "TS welcome")
It looks like the last few pages of that register were filled in after the event. The entries appear to be sequential up to October 1818, then it looks like the others from that point on that page (page web-address ending 0072Z.jpg) have been added after. They are in a different handwriting, and in no particular order (a few in family groups). The last page is the one which has the web-address ending 0076Z. So there are just over 4 pages of additional entries added to that register.
The Registration of Births, Deaths and Marriages (Scotland) Act 1854 called for all parochial registers up to 1819 to be submitted to the General Register Office for Scotland in 1855. So if you look up the lists of registers shown on their website, you will see for all parishes that registers finish and re-start on or around 1819. The parochial registers from 1820 to 1854 were to be given in to the local registrar (a new appointment from 1855) for safe keeping. Missing names could be added before these registers would be moved from the local parish into Register House, 30 years later, in 1885.
I have my feeling that names were added into the earlier registers shortly before they were submitted to Register House in 1855. It could be that your family names were added at that time; or it could be that a diligent session clerk did so at some intervening time. My strong feeling was that it was done in the lead-up to 1855, as that was when the registers would have to have their bindings taken apart to split them at 1819. My supposition was that a few blank pages were bound in when the earlier register was re-bound, and that these were filled with the details of (previously unrecorded) baptisms in the years leading up to 1819 (approximately as you will observe in the case of your family group.
None of the entries in the pages that I looked at (including those up to 1818 which were entered sequentially) have the phrases that you see in some parish registers, like "lawfully born to" or "naturally born to", which infer whether or not the parents were married at the time of the birth. The ones for your family group all refer to the mother of the child being the wife of the father, so the implication is that they were married (by the time of the first born in 1816). However as these entries were made at some later date, there is no real evidence to say that the parents were married or not at the times of the births of their children.
Like you, I see no sign of a record of the parents marriage, or the calling of the banns. So they may have been married by 1816, if you take the literal word of that entry in the register.
All the best,
AndrewP
