This question is prompted by something Adam Audette said in this excellent presentation:
http://www.rimmkaufman.com/blog/top-5-seo-conundrums/08062012/
First, I will lay out the issues:
1. All of our paginated pages have the same URL. To view this in action, go here: http://www.ccisolutions.com/StoreFront/category/audio-technica , scroll down to the bottom of the page and click "Next" - look at the URL. The URL is: http://www.ccisolutions.com/StoreFront/IAFDispatcher, and for every page after it, the same URL.
2. All of the paginated pages with non-unique URLs have canonical tags referencing the first page of the paginated series.
3. http://www.ccisolutions.com/StoreFront/IAFDispatcher has been instructed to be neither crawled nor indexed by Google.
Now, on to what Adam said in his presentation: At about minute 24 Adam begins talking about pagination. At about 27:48 in the video, he is discussing the first of three ways to properly deal with pagination issues. He says [I am somewhat paraphrasing]: "Pages 2-N should have self-referencing canonical tags - Pages 2-N should all have their own unique URLs, titles and meta descriptions...The key is, with this is you want deeper pages to get crawled and all the products on there to get crawled too. The problem that we see a lot is, say you have ten pages, each one using rel canonical pointing back to page 1, and when that happens, the products or items on those deep pages don't get get crawled...because the rel canonical tag is sort of like a 301 and basically says 'Okay, this page is actually that page.' All the items and products on this deeper page don't get the love."
Before I get to my question, I'll just throw out there that we are planning to fix the pagination issue by opting for the "View All" method, which Adam suggests as the second of three options in this video, so that fix is coming.
My question is this: It seems based on what Adam said (and our current abysmal state for pagination) that the products on our paginated pages aren't being crawled or indexed. However, our products are all indexed in Google. Is this because we are submitting a sitemap? Even so, are we missing out on internal linking (authority flow) and Google love because Googlebot is finding way more products in our sitemap that what it is seeing on the site? (or missing out in other ways?)
We experience a lot of volatility in our rankings where we rank extremely well for a set of products for a long time, and then disappear. Then something else will rank well for a while, and disappear. I am wondering if this issue is a major contributing factor.
Oh, and did I mention that our sort feature sorts the products and imposes that new order for all subsequent visitors? it works like this: If I go to that same Audio-Technica page, and sort the 125+ resulting products by price, they will sort by price...but not just for me, for anyone who subsequently visits that page...until someone else re-sorts it some other way. So if we merchandise the order to be XYZ, and a visitor comes and sorts it ZYX and then googlebot crawls, google would potentially see entirely different products on the first page of the series than the default order marketing intended to be presented there....sigh.
Additional thoughts, comments, sympathy cards and flowers most welcome. Thanks all!