I am fairly sure this is a quarter/rift sawn white oak floor that was stained a light golden/reddish color then probably shellaced or varnished and possibly waxed as well. If you do not want to have it completely refinished, then consider a through cleaning and a re-waxing. Here is a recommended cleaning and waxing procedure from Trewax.
Hardwood Floors
DIRECTIONS:
1. Dust mop all particles from floor.
2. Use Wood Cleaner to remove any dirt or old wax buildup. A piece of steel wool can be used in heavily soiled areas.
3. Apply Clear Paste Wax with a soft cloth or fine steel wool pad. Paste Wax should be applied going with the wood grain and spread evenly across the floors surface. Allow about one hour to dry and buff with a floor buffer or soft cloth.
4. When faced with old hardwood floors worn down by heavy traffic, utilize the Indian Sand Paste Wax following steps 1, 2, and 3 above. Apply two coats of wax in extremely worn areas.
5. If you desire a liquid coating for wood floors Clean & Wax can be applied with a lambs wool applicator or soft cloth (one or two thin coats as desired). Allow about one hour to dry and buff as described above.
6. When you desire a hard shell acrylic appearance on your wood floor, use Trewax® One Step. Apply one or two thin coats with a lambs wool applicator or soft cloth. Allow about one hour to dry. No buffing required. This is a permanent finish and cannot be removed. Reapply as needed.
REGULAR MAINTENANCE:
1. Dust mop or vacuum weekly.
2. Buff as desired to maintain a good shine. (Except One Step)
3. Re-wax every six months or as necessary.
Their website:
http://www.trewaxdirect.com/cgi-bin/cat ... egory=Wood
As for filling holes and cracks, you could consider using Woodwise Prefinished Nail Hole Filler (
http://www.woodwise.com/woodfiller/prefinish.html ) It comes in various colors that can be mixed together to create custom colors. The nice thing about it is it gets harder than some of the other colored putties. You could consider cleaning well and applying one coat of wax. Then when dry, fill your cracks and nail holes, then apply another coat of wax.